This section has 4 verses.
 
Titus 3:12-15
12 When I shall send Artemas unto thee, or Tychicus [TIK-uh-kus], be diligent to come unto me to Nicopolis [nih-KOP-uh-lis]: for I have determined there to winter.
13 Bring Zenas the lawyer and Apollos on their journey diligently, that nothing be wanting unto them.
14 And let ours also learn to maintain good works for necessary uses, that they be not unfruitful.
15 All that are with me salute thee. Greet them that love us in the faith. Grace be with you all. Amen.
 
We will begin with the Barclay commentary.

FINAL GREETINGS

First, the paraphrase of verses 12-15:

When I send Artemas or Tychicus [TIK-uh-kus] to you, do your best to come to me at Nicopolis [nih-KOP-uh-lis], for I have decided to spend the winter there.
Do your best to help Zenas the lawyer and Apollos on their way. See to it that nothing is lacking to them. And let our people too learn to practice fine deeds, that they may be able to supply all necessary needs, and that they may not live useless lives.
All who are with me send you their greetings. Greet those who love us in the faith.
Grace be with you all. Amen.

AS usual, Paul ends his letter with personal messages and greetings. Of Artemas, we know nothing at all. Tychicus [TIK-uh-kus] was one of Paul’s most trusted messengers. He was the bearer of the letters to the Colossian and the Ephesian churches (Colossians 4:7; Ephesians 6:21). Nicopolis [nih-KOP-uh-lis] was in Epirus [ih-PI-ruhs] and was the best centre for work in the Roman province of Dalmatia. It is interesting to remember that it was there that Epictetus [eh'pih-KYUR-uhs], the great Stoic philosopher, later had his school.

Quoted verses:
Colossians 4:7
All my state shall Tychicus declare unto you, who is a beloved brother, and a faithful minister and fellowservant in the Lord:

Ephesians 6:21
But that ye also may know my affairs, and how I do, Tychicus, a beloved brother and faithful minister in the Lord, shall make known to you all things:

Apollos was the well-known teacher (Acts 18:24). Of Zenas [ZEE-nuhs], we know nothing at all. He is here called a nomikos. That could mean one of two things. Nomikos is the regular word for a scribe, and Zenas may have been a converted Jewish Rabbi. It is also the normal Greek for a lawyer; and, if that is its meaning, Zenas has the distinction of being the only lawyer mentioned in the New Testament.

Quoted verse:
Acts 18:24
And a certain Jew named Apollos, born at Alexandria, an eloquent man, and mighty in the scriptures, came to Ephesus.

Paul’s last piece of advice is that the Christian people should practice good deeds, so that they themselves should be independent and also able to help others who are in need. Christian workers work not only to have enough for themselves but also to have something to give away.

Next come the final greetings; and then, as in every letter,

Paul’s last word is grace. ~Barclay Commentary

Now to the other commentaries. We will go from the general to the specific. Let us begin with the Matthew Henry main which, in this part, covers verses 9-15. I will break in where it discusses verses 12 and 13.

III. The apostle subjoins some further directions, Titus 3:12-13. Here are two personal things enjoined: -

1. That Titus should hold himself ready to come to Paul at Nicopolis [nih-KOP-uh-lis] (a city of Thrace, as is reckoned, on the borders of Macedonia), as soon as Artemas [AHR-tuh-muhs] or Tychicus [TIK-uh-kus] should be sent to Crete, to supply his place, and take care of the churches there when he should leave them. The apostle would not have them in their young and weak state be without one or other of chief sufficiency, to guide and help them. Titus, it seems, was not their ordinary fixed bishop or pastor, but an evangelist, otherwise Paul would not have called him so much from his charge. Of Artemas [AHR-tuh-muhs] we read little, but Tychicus [TIK-uh-kus] is mentioned on many occasions with respect. Paul calls him a beloved brother, and faithful minister, and fellow-servant in the Lord: one fit therefore for the service intimated. When Paul says to Titus, Be diligent to come to me to Nicopolis [nih-KOP-uh-lis], for I have determined there to winter, it is plain that the epistle was not written from Nicopolis [nih-KOP-uh-lis], as the postscript would have it, for then he would have said, I determined here, not there, to winter. ~Matthew Henry Main.

Now the Matthew Henry concise. It covers verses 12-15.

Christianity is not a fruitless profession; and its professors must be filled with the fruits of righteousness, which are by Jesus Christ, to the glory and praise of God. They must be doing good, as well as keeping away from evil. Let “ours” follow some honest labour and employment, to provide for themselves and their families. Christianity obliges all to seek some honest work and calling, and therein to abide with God. The apostle concludes with expressions of kind regard and fervent prayer. Grace be with you all; the love and favour of God, with the fruits and effects thereof, according to need; and the increase and feeling of them more and more in your souls. This is the apostle's wish and prayer, showing his affection to them, and desire for their good, and would be a means of obtaining for them, and bringing down on them, the thing requested. Grace is the chief thing to be wished and prayed for, with respect to ourselves or others; it is “all good.” ~Matthew Henry concise

Here is something from the Biblical Illustrator on the last phrase, that they be not unfruitful.

That nothing be wanting unto them

Titus’ duty to his fellow ministers
Ministers ought to abound in the fruits of kindness to one another, and most to those whose circumstances render the expressions of brotherly kindness needful. Probably Titus could not, from his own purse, furnish everything that was needful to his brethren who were travelling in the service of the Churches. But he might, through his influence, do by the hands of others what was not in his own power. The apostle had already said that the doctrine of salvation by grace teaches and constrains men who believe it to maintain good works. And here he calls on the believers under the care of Titus to embrace the occasion that was presented to them, of testifying their faith by their works, and learning to practice the duties by which they were to approve themselves unto God as faithful Christians. There are too many who form good resolves, but when opportunities offer of putting them into practice, suffer them to pass unimproved. They intend to do what they know to be right, but are in no haste to perform it.

But let ours, those who belong to our holy society, learn not only to do, but to stand foremost in doing, good works, on all necessary occasions. An opportunity for doing good ought to be as much valued by us as an opportunity for receiving it, for we are sure that “it is more blessed to give than to receive.” We know not what opportunities we may afterwards have to do good; but the present opportunity will not return; and we may feel the same disposition to neglect a second and a third as a first opportunity of usefulness. How then shall we approve ourselves fruit-bearing branches in the true vine, and not to be found among the barren branches against whom the terrible sentence is pronounced, that the great Husbandman will take them away, and they shall be gathered, and cast into the fire and burned? ~Biblical Illustrator

Here is another piece from the Biblical Illustrator that gets to the heart of the matter.

Christianity enjoins courtesy
Christianity hindereth not, but commendeth and enjoineth civil courtesy and all kind of humanity. For
1. Whatsoever pertaineth to love and good report, that must believers think on and do (Philippians 4:1-23).
2. The wisdom which is from above is gentle, peaceable, full of mercy and good fruits (James 3:17).
3. Those many commandments, that Christians should salute and greet one another, and that with a holy kiss (1 Thessalonians 5:26), called by Peter the kiss of love; usual in those East countries, by which outward testimony they declared mutual love and kindness.
4. Outward courtesy is a necessary virtue even for the maintaining of the bond of Christian peace; yea, availeth much for the nourishing and increasing the communion of saints, and society with God’s people.
5. How disgraceful a thing were it for the profession of Christ, that such as profess faith in the Lord Jesus should show themselves inhuman or hoggish, who should be as lambs and little children, for such are they who have entered into the kingdom of Christ, as the prophet witnesseth. Let this point, therefore, be well thought of, that as faith and love cannot be separate, so must good conscience and good manners go together.  ~Biblical Illustrator

Quoted verses:
Philippians 4:1-23
1 Therefore, my brethren dearly beloved and longed for, my joy and crown, so stand fast in the Lord, my dearly beloved.
2 I beseech Euodias, and beseech Syntyche [SIN-tih-kee], that they be of the same mind in the Lord.
3 And I intreat thee also, true yokefellow, help those women which laboured with me in the gospel, with Clement also, and with other my fellowlabourers, whose names are in the book of life.
4 Rejoice in the Lord alway: and again I say, Rejoice.
5 Let your moderation be known unto all men. The Lord is at hand.
6 Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
7 And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
8 Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
9 Those things, which ye have both learned, and received, and heard, and seen in me, do: and the God of peace shall be with you.
10 But I rejoiced in the Lord greatly, that now at the last your care of me hath flourished again; wherein ye were also careful, but ye lacked opportunity.
11 Not that I speak in respect of want: for I have learned, in whatsoever state I am, therewith to be content.
12 I know both how to be abased, and I know how to abound: every where and in all things I am instructed both to be full and to be hungry, both to abound and to suffer need.
13 I can do all things through Christ which strengtheneth me.
14 Notwithstanding ye have well done, that ye did communicate with my affliction.
15 Now ye Philippians know also, that in the beginning of the gospel, when I departed from Macedonia, no church communicated with me as concerning giving and receiving, but ye only.
16 For even in Thessalonica ye sent once and again unto my necessity.
17 Not because I desire a gift: but I desire fruit that may abound to your account.
18 But I have all, and abound: I am full, having received of Epaphroditus [ee-paf-roh-DI-tuhs] the things which were sent from you, an odour of a sweet smell, a sacrifice acceptable, wellpleasing to God.
19 But my God shall supply all your need according to his riches in glory by Christ Jesus.
20 Now unto God and our Father be glory for ever and ever. Amen.
21 Salute every saint in Christ Jesus. The brethren which are with me greet you.
22 All the saints salute you, chiefly they that are of Caesar's household.
23 The grace of our Lord Jesus Christ be with you all. Amen.

James 3:17
But the wisdom that is from above is first pure, then peaceable, gentle, and easy to be intreated, full of mercy and good fruits, without partiality, and without hypocrisy.

1 Thessalonians 5:26
Greet all the brethren with an holy kiss [Christian affection].

Now to the specific commentaries. They generally break the verse down this way:

1] Zenas the lawyer.
2] Apollos.
3] Their journey diligently.
4] That nothing be wanting unto them.

1] Zenas the lawyer.

Bring Zenas the lawyer - This person is only mentioned in this place; whether he was a Jewish, Roman, or Greek lawyer, we cannot tell. ~Adam Clarke

Bring Zenas the lawyer - This person is not elsewhere mentioned in the New Testament, and nothing more is known of him. He belonged doubtless to that class of persons so often mentioned in the New Testament as lawyers; that is, who were regarded as qualified to expound the Jewish laws; see the notes at Matthew 22:35. It does not mean that he practiced law, in the modern sense of that phrase. He had doubtless been converted to the Christian faith, and it is not improbable that there were Jews at Nicopolis, and that Paul supposed he might be particularly useful among them. ~Barnes Notes

Quoted verse:
Matthew 22:35
Then one of them, which was a lawyer, asked him a question, tempting him, and saying,

Bring Zenas the lawyer - Whether he was brought up to the civil law, either among the Greeks or Romans, is not certain; it may be he was a Jewish lawyer, or scribe, an interpreter of Moses' law among the Jews; for with them a lawyer and a scribe were one and the same. ~John Gill

2] Apollos.

And Apollos - Of this person we have some valuable particulars in Acts 18:24; 1 Corinthians 1:12; 1 Corinthians 3:5-6; 1 Corinthians 4:6. Either Paul had left these at Crete when he visited that island, or he had heard that, in their evangelical itinerancy [ahy-tin-er-uh n-see-traveling], they were about to pass through it. ~Adam Clark

Quoted verses:
Acts 18:24
And a certain Jew named Apollos, born at Alexandria, an eloquent man, and mighty in the scriptures [well-instructed], came to Ephesus.

1 Corinthians 1:12
Now this I say, that every one of you saith, I am of Paul; and I of Apollos; and I of Cephas; and I of Christ.

1 Corinthians 3:5-6
5 Who then is Paul, and who is Apollos, but ministers by whom ye believed, even as the Lord gave to every man?
6 I have planted, Apollos watered; but God gave the increase.

1 Corinthians 4:6
And these things, brethren, I have in a figure transferred to myself and to Apollos for your sakes; that ye might learn in us not to think of men above that which is written, that no one of you be puffed up for one against another.

And Apollos - Notes, Acts 18:24. He was also well-skilled in the laws of Moses, being “mighty in the Scriptures” Acts 18:24, and he and Zenas appear to have been traveling together. It would seem that they had been already on a journey, probably in preaching the gospel, and Paul supposed that they would be in Crete, and that Titus could aid them. ~Barnes Notes

Quoted verse:
Acts 18:24
...quoted above.

And Apollos, on their journey diligently - who was a Jew born at Alexandria, an eloquent man, and mighty in the Scriptures; who had preached at Corinth, but was now at Crete; and whom the apostle, with Zenas, would have provided with everything necessary for their journey. ~John Gill

3] Their journey diligently

On their journey diligently - Afford them the means to defray their expenses. The Churches through which these evangelists passed, bore their expenses from one to the other. ~Adam Clarke

Diligently - 2 Timothy 4:9; Greek Speedily; i. e., facilitate their journey as much as possible. ~Barnes Notes

Quoted verse:
2 Timothy 4:9 [see Lesson]
Do thy diligence to come shortly unto me:

Diligence: constant and earnest effort to accomplish what is undertaken; persistent exertion of body or mind.

4] That nothing be wanting unto them.

That nothing be wanting unto them - which might be proper for them in their travels, to make them comfortable, and their journey pleasant and easy. ~John Gill

That nothing be wanting unto them - Nothing necessary for their journey. Paul desired that they might meet with hospitable treatment from Christians in Crete, and might not be embarrassed for the want of that which was needful for their journey. It would seem most probable that they [Zenas and Apollos] had been sent by Paul on a visit to the churches. ~Barnes Notes

What did we learn?

1] That Zenas and Apollos are your brothers in Christ and are faithful servants of the Work of God.  They were mighty in the scriptures.
2] That God calls individuals to the salvation process and puts them to work.
3] That we are to do our duties before God with diligence.
4] Christianity enjoins courtesy--faith and love cannot be separate, so must good conscience [your individual life in the salvation process] and good manners [your diligence to others] go together.
5] God gives us opportunities to do good works.  Today's opportunities will never return.
6] Testify your faith by your works. An opportunity for doing good ought to be as much valued by us as an opportunity for receiving it.
7] Learn not only to do, but to stand foremost in doing good works, on all necessary occasions and with every passing opportunity.

These are the lessons of verse 13.