And as He was going through, he saw a man blind from birth. His disciples asked him: “Rabbi, who sinned? This man or his parents that he was born blind?” Jesus answered: “Neither this man sinned nor his parents. This is in order that the works of God should be manifest in him. We must work the works of him who sent us while it is still day, night is coming when no one can work. While I am in the world, I am the light of the world.” When he had said this he spat on the ground and made clay out of the spittle and anointed his eyes and said to him: “Go now to the pool of Siloam” (which is translated Sent) “and wash.” The man then went away and washed and came back seeing.

John 9:1-7

Cause and effect is a usual way of thinking for us humans: Something happens and we seek a cause for it. In this case the disciples had been taught that the reason for illness is sin. The problem they had is that this man was born blind so there were only two possible explanations in their minds: either the man sinned while he was in the womb or his parents sinned and he felt the effects of that sin.

Jesus saw things differently. He knew that he was about to abolish sin on the cross (Ephesians 2:14-16, Colossians 1:13-14) and so change everything. 

Jesus didn’t come into the world to condemn the world but that the world might be saved through Him (John 3:17). Sin is dealt with, so He doesn’t concern Himself with that. Now every disease, sickness, infirmity, addiction is an opportunity for God to be glorified. In this case God is glorified by restoring the sight of the blind man.

Let’s see every weakness of the flesh as an opportunity for God to work instead of trying to work out why it has happened. People don’t need our assessments, they need our love and the power of God working through that.