Are you kidding me?
or there are many insubordinate, both idle talkers and deceivers, especially those of the circumcision, 11whose mouths must be stopped, who subvert whole households, teaching things which they ought not, for the sake of dishonest gain. 12One of them, a prophet of their own, said, “Cretans are always liars, evil beasts, lazy gluttons.” 13This testimony is true. Therefore rebuke them sharply, that they may be sound in the faith, 14not giving heed to Jewish fables and commandments of men who turn from the truth. 15To the pure all things are pure, but to those who are defiled and unbelieving nothing is pure; but even their mind and conscience are defiled. 16They profess to know God, but in works they deny Him, being [d]abominable, disobedient, and disqualified for every good work.
"A prophet of their own" is not a Cretan. He is one of these of the circumcision (judaisers) who's mouths must be stopped. Paul is not agreeing with this "prophet". "This testimony is true" is not the testimony of the prophet- it is Paul's testimony about him which he is saying is true.
or there are many insubordinate, both idle talkers and deceivers, especially those of the circumcision, 11whose mouths must be stopped, who subvert whole households, teaching things which they ought not, for the sake of dishonest gain. 12One of them, a prophet of their own, said, “Cretans are always liars, evil beasts, lazy gluttons.” 13This testimony is true. Therefore rebuke them sharply, that they may be sound in the faith, 14not giving heed to Jewish fables and commandments of men who turn from the truth. 15To the pure all things are pure, but to those who are defiled and unbelieving nothing is pure; but even their mind and conscience are defiled. 16They profess to know God, but in works they deny Him, being [d]abominable, disobedient, and disqualified for every good work.
"A prophet of their own" is not a Cretan. He is one of these of the circumcision (judaisers) who's mouths must be stopped. Paul is not agreeing with this "prophet". "This testimony is true" is not the testimony of the prophet- it is Paul's testimony about him which he is saying is true.
"Epimenides of Phæstus, or Gnossus, in Crete, about 600. He was sent for to purify Athens from its pollution occasioned by Cylon. He was regarded as a diviner and prophet. The words here are taken probably from his treatise "concerning oracles." Paul also quotes from two other heathen writers, ARATUS (Ac 17:28) and MENANDER (1Co 15:33), but he does not honor them so far as even to mention their names." Jamieson-Faussett-Brown Commentary.
"It was a Cretan prophet, one of their own countrymen, who said, ‘Cretans were ever liars, vicious brutes, lazy gluttons’— and how truly he spoke! All the more reason why you should rebuke them sharply, so that they may be restored to a sound faith, instead of paying heed to Jewish myths and to human commandments, the work of those who turn their backs on the truth." (Titus 1:12-14, REB)
Maybe too much turkey made you sleepy and you were having synapse lapses!