It is significant that Jesus' command is simple, containing only seven words: "Go, wash in the pool of Siloam." It was also personal, directed to the blind man alone. In addition, the command involved a test of obedience, requiring a response to Jesus. Finally, it encouraged the man, despite his not being able to see the compassion in Jesus' eyes. He somehow knew that the One whose voice he heard would help him.
Christ's command tested the man's faith, confirming and strengthening it. Without delay or reluctance, he obeyed the divine command: He went and washed and saw. Many would consider it a useless chore for a blind man to do such a simple thing to obtain his sight, but having obeyed, the man was healed. Blessing still comes through obedience. In one sense, he obeyed Christ blindly, but as a result, he immediately received his sight, beginning down a path by which he eventually also received true spiritual sight.
In the same way, the gospel that comes to us is simple. God requires us to respond in faith, and when we do—when we understand and believe that the Son of God became human to enable mankind's salvation—our spiritual blindness begins to be removed.
Martin G. Collins
The Miracles of Jesus Christ: Healing a Man Born Blind (Part Two)