His disciples asked Him, “Rabbi, who sinned, this man or his parents, that he was born blind?” Jesus answered, “Neither this man nor his parents sinned, but this happened that the works of God would be displayed in him. 4
John 9:3
Jesus statement that the man was born not because of his sin or the sin of his parents is a source of bewilderment to many, who think he meant that God arbitrarily denied sight to the man in order that his divine healing power might be manifested through Jesus. To those who know God as the the all-compassionate father, it is inconceivable that he would use one of his children to suffer for years merely to create an opportunity for a miraculous display.
Rather, Jesus meant that the mans affliction was linked to hidden causes formulated in his past lives that brought him to his present condition, and not anything he or his parents had done on their current incarnations. In any case, since the man was born blind, there was no opportunity for any sin in his present existence to be the cause of his malady. Nevertheless, being good in his present life, and drawing from past-life virtues, he had accrued sufficient good karma " that the works of God should be made manifest in him" that is to merit a miracle of divine healing by his coming in contact with God's emissary, Jesus.
Paramahansa Yogananda