2 Timothy 2:13; 2 Timothy 2:21; 2 Timothy 4:3

13 If we are faithless, He remains faithful, for He cannot deny Himself.
21 Therefore, if anyone cleanses himself from these things, he will be a vessel for honor, sanctified, useful to the Master, prepared for every good work.
3 For the time will come when they will not endure sound doctrine; but wanting to have their ears tickled, they will accumulate for themselves teachers in accordance to their own desires,