"And when affliction touches man," meaning: an illness, "he calls upon his Lord, turning to Him," meaning: he calls upon Him with sincerity that He may remove it from him. "Then when He bestows upon him a favor from Himself," meaning: He grants him wellness from that illness, "he forgets that for which he called upon Him before." It is like His saying: "He passed on as if he had not called upon Us to"