“They profess that they know God; but in works they deny him, being abominable, and disobedient, and unto every good work reprobate.”
King James Version (KJV)
1:14 Commandments of men - The Jewish or other teachers, whoever they were that turned from the truth.
1:15 To the pure - Those whose hearts are purified by faith this we allow. All things are pure - All kinds of meat; the Mosaic distinction between clean and unclean meats being now taken away. But to the defiled and unbelieving nothing is pure - The apostle joins defiled and unbelieving, to intimate that nothing can be clean without a true faith: for both the understanding and conscience, those leading powers of the soul, are polluted; consequently, so is the man and all he does.
Tit 1:16 They profess that they know God. These teachers of Jewish fables and carnal ordinances profess to know and serve God, yet their immoral lives are a denial of him.