Here in Titus 1 verse 15 we see the attitudes of the false teachers, they are totally and completely impure contrasted with the truly saved person’s. In verse 16 their actions are shown. This is the hinge verse of the whole book, it shows they are teaching that what a person believes and how they behave are not related. They are teaching that Godly living is not a necessary result of being a Christian. Anyone who believes this is not a Christian. Godly living is always a result of being saved. When you see a person who talks the talk, but they don’t walk the walk, they are either not a Christian or severely out of the will of God and about to be disciplined by Him if they aren’t being already. The whole book of 1st John shows this over and over again as does James and many other New Testament books of the Bible. Has your faith touched your behavior, if not you need to examine yourself to see whether you are in the faith or not (2 Corinthians 13:5).
Titus 1:15 To 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. 16 They profess to know God, but in works they deny Him, being abominable, disobedient, and disqualified for every good work.