When God allows bad things to happen to Good people.

I. The man who was born blind.

John 9:1–3 (KJV 1900)

‎And as Jesus passed by, he saw a man which was blind from his birth. 2 And his disciples asked him, saying, Master, who did sin, this man, or his parents, that he was born blind? 3 Jesus answered, Neither hath this man sinned, nor his parents: but that the works of God should be made manifest in him.

II. Lazarus

John 11:1–4 (KJV 1900)

Now a certain man was sick, named Lazarus, of Bethany, the town of Mary and her sister Martha. 2 (It was that Mary which anointed the Lord with ointment, and wiped his feet with her hair, whose brother Lazarus was sick.) 3 Therefore his sisters sent unto him, saying, Lord, behold, he whom thou lovest is sick. 4 When Jesus heard that, he said, This sickness is not unto death, but for the glory of God, that the Son of God might be glorified thereby.