Titus 1:16

16They profess that they know God He treats those persons as they deserve; for hypocrites, who give their whole attention to minute observances, despise fearlessly what constitutes the chief part of the Christian life. The consequence is, that they display their vanity, while contempt of God is manifested in open crimes. And this is what Paul means; that they who wish to be seen abstaining from one kind of food — indulge in wantonness and rebellion, as if they had shaken of the yoke; that their conduct is disgraceful and full of wickedness, and that not a spark of virtue is visible in their whole life.

For they are abominable, disobedient, and to every good work reprobate. When he calls them , βδελυκτούς (237) abominable, he seems to allude to their pretended holiness, to which they gave their earnest attention. But Paul declares that they gain no advantage, for they do not cease to be profane and detestable. With good reason does he accuse them of disobedience; for nothing can be more haughty than hypocrites, who exert themselves so laboriously about ceremonies, in order that they may have it in their power to despise with impunity the chief requirements of the law. We may appropriately interpret the word ἀδόκιμοι reprobate in an active signification; as if he had said, that they who wish to be thought so sagacious instructors in trifles — are destitute of judgment and understanding as to good works.