"that I may believe in Him"

36 He answered, “And who is He, sir, that I may believe in Him?” 37 Jesus said to him, “You have seen Him, and it is He who is speaking to you.” (John 9:36-37 ESV) 

The healed man, in whose situation Jesus had already done a mighty work, was ready to believe. The man's physical need had been met, and now his spiritual need–his greatest need; his need to know Jesus–was met. Jesus healed the man, He found the man, He spoke to the man, and He revealed Himself to the man. The Lord was powerful, persistent, and gentle in reaching out to this man and in calling him to faith.