John Chrysostom — as excerpted in the Catena Aurea on John 5:1-13

“(Hom. xxxiii. 1, 2) He did not, however, proceed immediately to heal him, but first tried by conversation to bring him into a believing state of mind. Not that He required faith in the first instance, as He did from the blind man, saying, Believe ye that I am able to do this? (Matt. 9:28) for the lame man could not well know who He was. Persons who in different ways had had the means of knowing Him, were asked this question, and properly so. But there were some who did not and could not know Him yet, but would be made to know Him by His miracles afterwards. And in their case the demand for faith is reserved till after those miracles have taken place: When Jesus saw him lie, and knew that he had been a long time in that case, He saith unto him, Wilt thou be made whole? He does not ask this question for His own information, (this were unnecessary,) but to bring to light the great patience of the man, who for thirty and eight years had sat year after year by the place, in the hope of being cured; which sufficiently explains why Christ passed by the others, and went to him. And He does not say, Dost thou wish Me to heal thee? for the man had not as yet any idea that He was so great a Person. Nor on the other hand did the lame man suspect any mockery in the question, to make him take offence, and say, Hast thou come to vex me, by asking me if I would be made whole; but he answered mildly, Sir, I have no man, when the water is troubled, to put me into the pool; but while I am coming, another steppeth down before me. He had no idea as yet that the Person who put this question to him would heal him, but thought that Christ might probably be of use in putting him into the water. But Christ’s word is sufficient, Jesus saith unto him, Rise, take up thy bed, and walk.”