They profess that they know God; but in works they deny him, being abominable, and disobedient, and unto every good work reprobate.
All Commentaries on Titus 1:16 Go To Titus 1
George Leo Haydock
They confess that they know God. He speaks not therefore of those who were properly infidels, without the knowledge of the true God; so that it is foolish to pretend from hence, that every action of an infidel must be a sin. (Witham)