Titus 1:13

This testimony is true. For which cause reprove them sharply, that they may be sound in the faith,

It was not implied by the apostle that there were no exceptions, because the very existence of congregations of Christians on the island demonstrated that a remnant of the population were striving for better things; and yet they were in danger of being seduced and won back to the old ways, hence the need to reprove and rebuke behavior unbecoming to the name of Christ.

Sound in the faith ... means, objectively, soundness in the Christian religion, this being an important witness that the faith which saves is not merely a subjective trust/faith; for it is founded in a behavior and life-style compatible with the teachings of the Master. No person is "sound in the faith" who is not doing, or who is making no effort to do, the will of Christ.

Before leaving Paul's testimony regarding Epimenides, it is interesting to note that "This affords Scriptural authority for believing that in some small degree the ancient Gentile nations had their own prophets."[29]