Speak these things, and exhort, and reprove This conclusion is of the same meaning as if he enjoined Titus to dwell continually on that doctrine of edification, and never to grow weary, because it cannot be too much inculcated. He likewise bids him add the spurs of "exhortations and reproofs;" for men are not sufficiently admonished as to their duty, if they be not also vehemently urged to the performance of it. He who understands those things which the Apostle has formerly stated, and who has them always in his mouth, will have ground not only for teaching, but likewise for correcting. With all authority I do not agree with Erasmus, who translates epitage "diligence in commanding." There is greater probability in the opinion of Chrysostom who interprets it to mean severity against more atrocious sins; through I do not think that even he has hit the Apostle's meaning; which is, that Titus should claim authority and respect for himself in teaching these things. For men given to curious inquiries, and eager about trifles, dislike the commandments to lead a pious and holy life as being too common and vulgar. In order that Titus may meet this disdain, he is enjoined to add the weight of his authority to his doctrine. It is with the same view (in my opinion) that he immediately adds, -- Let no man despise thee Others think that Titus is instructed to gain the ear of men, and their respect for him, by the integrity of his life; and it is indeed true that holy and blameless conduct imparts authority to instruction. But Paul had another object in view; for here he addresses the people rather than Titus. Because many had ears so delicate, that they despised the simplicity of the gospel; because they had such an itch for novelty, that hardly any space was left for edification; he beats down the haughtiness of such men, and strictly charges them to desist from despising, in any way, sound and useful doctrine. This confirms the remark which I made at the outset, that this Epistle was written to the inhabitants of Crete rather than to any single individual.

These things speak and exhort - Notes, 1-Timothy 6:2.
And rebuke with all authority - 1-Timothy 5:1, note, 20, note; 2-Timothy 4:2 note. The word "authority" here means command - ἐπιταγὴ epitagē; 1-Corinthians 7:6, 1-Corinthians 7:25; 2-Corinthians 8:8; 1-Timothy 1:1; Titus 1:3. The sense here is, he was to do it decidedly, without ambiguity, without compromise, and without keeping anything back. He was to state these things not as being advice or counsel, but as the requirement of God.
Let no man despise thee - That is, conduct yourself, as you may easily do, so as to command universal respect as a minister of God; see the notes at 1-Timothy 4:12.

These things speak - That is, teach; for λαλει, speak, has the same meaning here as διδασκε, teach, which, as being synonymous, is actually the reading of the Codex Alexandrinus.
And exhort - Παρακαλει· Repeat them again and again, and urge them on their attention and consciences.
And rebuke - Ελεγχε· Demonstrate the importance, utility, and necessity of them; and show them that God requires their obedience.
With all authority - Μετα πασης επιταγης· With all that authority with which thy office invests thee, and which thou hast received from God.
Let no man despise thee - That is: Acts so that no person shall have any cause to despise thee, either for thy work, or the manner and spirit is which thou dost perform it.
1. Few portions of the New Testament excel this chapter. It may well form the creed, system of ethics, and text book of every Christian preacher. Does any man inquire what is the duty of a Gospel minister! Send him to the second chapter of the Epistle to Titus for a complete answer. There he will find what he is to believe, what he is to practice, and what he is to preach. Even his congregation is parcelled out to him. The old and the young of both sexes, and those who are in their employment, are considered to be the objects of his ministry; and a plan of teaching, in reference to those different descriptions of society, is laid down before him. He finds here the doctrine which he is to preach to them, the duties which he is required to inculcate, the motives by which his exhortations are to be strengthened, and the end which both he and his people should have invariably in view.
2. The Godhead of Jesus Christ is here laid down in a most solemn and explicit manner: He is the great God our Savior, ὁ μεγας Θεος και Σωτηρ· human language can go no higher, and the expressions are such, and are so placed, that it is impossible either to misunderstand or to misapply them. He who is the great God, higher than the highest, is our Savior; he who is our Savior is the great God; but Jesus Christ is our Savior, and Jesus Christ is here stated to be the great God.
3. The extent of human redemption is here also pointed out. The saving grace of this great God hath shone out upon every man; none has been passed by, none left uninfluenced, none without the first offer of life eternal, and a sufficiency of grace to qualify him for the state.
4. The operation of Divine grace in preparing the soul for glory is next referred to. It cleanses us from all unrighteousness, it purifies us unto God, and makes us fervent and abundant in good works. This system is worthy of God, and is properly suited to the state and necessities of man. These are truths which must be preached, which are not preached enough, and which cannot be preached too often. Awake, pastors! and do not the work of the Lord carelessly. Awake, people! and believe to the saving of your souls. How shall he who is styled a minister of the Gospel, and who neither knows, feels, nor heartily inculcates these things, give an account in the great day, of himself, his calling, and his flock, to God? And when this Gospel is preached faithfully and zealously, how shall the people escape who neglect so great a salvation? Neglect, in such a case, is the highest contempt which man can offer to his Maker. Surely such conduct must expect judgment without mixture of mercy. Reader, lay this to heart.

These things speak, and exhort, and rebuke with all (g) authority. Let no man despise thee.
(g) With all authority possible.

These things speak and exhort,.... Sound doctrine, the doctrine of grace, the doctrines of salvation and redemption by Christ, of peace, pardon, and cleansing by his blood; these speak out clearly, plainly, publicly, boldly, and faithfully: and the things which become sound doctrine; the duties of religion suitable to every age and sex, a denying of ungodliness and worldly lusts, a sober, righteous, and godly life and conversation, exhort unto; and encourage the saints to be zealous of good works, and comfort them with the expectation of the blessed hope, and glorious appearance of Christ.
And rebuke with all authority; such as imbibe errors and heresies, or indulge to vice and wickedness, with the authority both of Christ and his church, in the name of the one, and by the order and vote of the other, that the reproof may come with the greater weight; and in a grave and solemn manner, suitable to the dignity of the ministerial office and character, and with that sharpness and severity the offence requires.
Let no man despise thee; as negligent in the discharge of his office, or as doing it in a pusillanimous manner, or as behaving in his life and conversation unworthy of the character he bore, and so is a direction to himself; or else it may be considered as designed for the churches in Crete, and the professors of religion, and to be an instruction to them to value Titus, and treat him with respect, and not with contempt; which shows that this epistle was not written for Titus only, or for his own use, but for the service of others. The Ethiopic version reads, "let no man deceive thee".

with all authority--Translate, "authoritativeness" (compare "sharply," Titus 1:13).
Let no man despise thee--Speak with such vigor as to command respect (1-Timothy 4:12). Warn them with such authority that no one may think himself above (so the Greek literally) the need of admonition [TITTMANN, Greek Synonyms of the New Testament].

Let no man despise thee - That is, let none have any just cause to despise thee. Yet they surely will. Men who know not God will despise a true minister of his word.