What does John 9:37 mean?

Jesus is speaking to a man He'd healed of lifelong blindness (John 9:1–7). At that time, Jesus sent the still-blind man off to wash his eyes, resulting in sight. This conversation is the first time the man has physically "seen" the person who granted him vision. Jesus' question, posed in verse 35, was an opportunity for the beggar to explain his own faith. Jesus asked the man if he believed in the "Son of Man," a title tied to the Jewish concept of the Messiah (Daniel 7:13; 9:25). In response, the man admitted his own ignorance and his willingness to believe. This is a strong contrast to the scribes and Pharisees who have more than enough information (John 5:39–40) but who simply did not want to understand (John 7:17).

Since the once-blind man does not know who the "Son of Man"—the Messiah—actually is, Jesus tells him. It's Jesus Himself, the one standing right there speaking with the now-seeing man. Once again, the man's response differs drastically from that of Jesus' religious critics. Following his own advice (John 9:27), the man will immediately confess his faith in the Promised One.