Hebrews 12:10-11

12:10 For they disciplined us for a little while as seemed good to them, but he does so for our benefit, that we may share his holiness. 12:11 Now all discipline seems painful at the time, not joyful. But later it produces the fruit of peace and righteousness for those trained by it.

Hebrews 12:15

12:15 See to it that no one comes short of the grace of God, that no one be like a bitter root springing up and causing trouble, and through him many become defiled.