Hebrews 12:6, 8, 10

For the LORD disciplines those he loves, and he punishes each one he accepts as his child.”

If God doesn’t discipline you as he does all of his children, it means that you are illegitimate and are not really his children at all.

For our earthly fathers disciplined us for a few years, doing the best they knew how. But God’s discipline is always good for us, so that we might share in his holiness.