Romans 8:28-29 (CB)

And we know that for those who love God all things work together for good, for those who are called according to his purpose. For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers.

God never allows pain without a purpose in the lives of His children. He never allows Satan, nor circumstances, nor any ill-intending person to afflict us unless He uses that affliction for our good. God never wastes pain. He always causes it to work together for our ultimate good, the good of conforming us more to the likeness of His Son.