“Rabbi, who sinned, this man or his parents, that he was born blind?” The disciples regarded this man as an unsolved riddle. They showed no interest in helping the man, but in discussing the cause for his condition.

Jesus will soon show a different way. He won’t dwell on the theological puzzle, but on actually helping the man. “It is ours, not to speculate, but to perform acts of mercy and love, according to the tenor of the gospel. Let us then be less inquisitive and more practical, less for cracking doctrinal nuts, and more for bringing forth the bread of life to the starving multitudes.” (Spurgeon)

This is from EnduringWord.com if anyone is interested. Really nice commentary that helps you understand.