One of themselves, even a prophet of their own - This was Epimenides, who was born at Gnossus, in Crete, and was reckoned by many the seventh wise man of Greece, instead of Periander, to whom that honor was by them denied. Many fabulous things are related of this poet, which are not proper to be noticed here. He died about 538 years before the Christian era. When St. Paul calls him a prophet of their own, he only intimates that he was, by the Cretans, reputed a prophet. And, according to Plutarch, (in Solone), the Cretans paid him divine honors after his death. Diogenes Laertius mentions some of his prophecies: beholding the fort of Munichia, which guarded the port of Athens, he cried out: "O ignorant men! if they but knew what slaughters this fort shall occasion, they would pull it down with their teeth!" This prophecy was fulfilled several years after, when the king, Antipater, put a garrison in this very fort, to keep the Athenians in subjection. See Diog. Laert., lib. i. p. 73.

Plato, De Legibus, lib. ii., says that, on the Athenians expressing great fear of the Persians, Epimenides encouraged them by saying "that they should not come before ten years, and that they should return after having suffered great disasters." This prediction was supposed to have been fulfilled in the defeat of the Persians in the battles of Salamis and Marathon.

He predicted to the Lacedemonians and Cretans the captivity to which they should one day be reduced by the Arcadians. This took place under Euricrates, king of Crete, and Archidamus, king of Lacedemon; vide Diog. Laert., lib. i. p. 74, edit. Meibom.

It was in consequence of these prophecies, whether true or false, that his countrymen esteemed him a prophet; that he was termed ανηρ αθειος, a divine man, by Plato; and that Cicero, De Divin., lib. i., says he was futura praesciens, et vaticinans per furorem: "He knew future events, and prophesied under a divine influence." These things are sufficient to justify the epithet of prophet, given him here by St. Paul. It may also be remarked that vates and poeta, prophet and poet, were synonymous terms among the Romans.

The Cretians are always liars - The words quoted here by the apostle are, according to St. Jerome, Socrates, Nicephorus, and others, taken from a work of Epimenides, now no longer extant, entitled Περι χρησμων· Concerning Oracles. The words form a hexameter verse: -

Κρητες αει ψευσται, κακα θηρια, γαστερες αργαι.

The Cretans are always liars; destructive wild beasts; sluggish gluttons.

That the Cretans were reputed to be egregious liars, several of the ancients declare; insomuch that Κρητιζειν, to act like a Cretan, signifies to lie; and χρησθαι Κρητισμῳ, to deceive. The other Greeks reputed them liars, because they said that among them was the sepulchre of Jupiter, who was the highest object of the Greek and Roman worship. By telling this truth, which all others would have to pass for a lie, the Cretans showed that the object of their highest admiration was only a dead man.

Evil beasts - Ferocious and destructive in their manners.

Slow bellies - Addicted to voluptuousness, idleness, and gluttony; sluggish or hoggish men.

of.

Acts 17:28 For in him we live, and move, and have our being; as certain also of your own poets have said, For we are also his offspring.

liars.

Romans 16:18 For they that are such serve not our Lord Jesus Christ, but their own belly...

1 Timothy 4:2 Speaking lies in hypocrisy; having their conscience seared with a hot iron;

2 Peter 2:12,15 But these, as natural brute beasts, made to be taken and destroyed, speak evil of the things that they understand not...

Jude 1:8-13 Likewise also these filthy dreamers defile the flesh, despise dominion, and speak evil of dignities...

Whether Conscience be a Power?
Objection 1: It would seem that conscience is a power; for Origen says [*Commentary on Rom. 2:15] that "conscience is a correcting and guiding spirit accompanying the soul, by which it is led away from evil and made to cling to good." But in the soul, spirit designates a power---either the mind itself, according to the text (Eph. 4:13), "Be ye renewed in the spirit of your mind"---or the imagination, whence imaginary vision is called spiritual, as Augustine says (Gen. ad lit. xii, 7,24). Therefore …
Saint Thomas Aquinas—Summa Theologica

Confessing Christ an Indispensable Duty.
"--If we deny him, he also will deny us." This is predicated of Christ; and looks forward to the day when all mankind will stand before him as their judge. Denying Christ is here declared to be a mortal sin. Those found guilty of it will hear that sentence--"Depart ye cursed!" But this is to be understood only of a persevering denial of him. Those who turn by a timely repentance, will find mercy. This is true of every sin. But repentance may be too late. It must antecede death, or it will be of …
Andrew Lee et al—Sermons on Various Important Subjects

Evil Habits and Injurious Indulgences.
The Word of the Lord may not denominate in plain terms every particular sin and evil practise man may engage in; however there are general terms and principles of righteousness that prohibit and condemn every possible sinful act man may perform. The words card-parties, picnics, fairs, shows and theaters are not found in the writings of the apostles; however indulgence in these is "revelry," "living in pleasure," "rioting" and worldliness, of which the Scriptures say the participants do not love God …
Charles Ebert Orr—The Gospel Day