Thematic Bible: Why the lord chastens people

Because of chastening ye endure; God is treating you as with sons, for what son is there whom a father does not chasten? And if ye are without chastening, of which all have become participants, then ye are bastards, and not sons. Besides, we indeed have had chastisers--the fathers of our flesh--and we were turned around. Shall we not much more be subordinate to the Father of the spirits, and we will live? read more.
For those men indeed for a few days chastened us according to that which seemed good to them, but he for that which is advantageous, in order to be partakers of his holiness.

But if we were discerning ourselves we would not be judged. But when we are judged by Lord, we are chastened so that we may not be condemned with the world.