Titus 1:15-16

15If someone is clean and good inside, everything is clean and good for them to enjoy. But if someone is not a believer and has an unclean mind, nothing is clean or good for that person. Their minds no longer think properly. They no longer feel guilty when they do something wrong.

16People like that say that they know God. But they do disgusting things. This shows that they do not know him. They are completely bad. They refuse to obey God. They are not able to do anything good.