Phil 2:12-13:
So then, my beloved, just as you have always obeyed, not as in my presence only, but now much more in my absence, work out your salvation with fear and trembling; 13 for it is God who is at work in you, both to will and to work for His good pleasure.
1 Timothy 4:7:
But have nothing to do with worldly fables fit only for old women. On the other hand, discipline yourself for the purpose of godliness...