Faith comes from hearing and knowing

Luke 18:31-43
Jesus foretells his death a third time, his disciples did not grasp what he was said.
This is the seventh time Luke has recorded Jesus predicting his suffering: in general terms in 5:35, 12:50, 13:32-33; 17:25: with specific detail in 9:22, 43-45and here, where he speaks of being handed over to the Gentiles, and of his resurrection.
Son of David, have mercy on me! He cried out all the more.
A blind beggar was healed by Jesus, Jesus said to him, "Recover your sight. your faith has made you well."
When all the people saw it, gave praise to God.
Why?
Jesus healed the blind beggar with His power and beggar's faith.
All glory and honor gives to God, not to anyone in the world.
The blind man knows that Jesus is son of David. His physical eyes are blind but his heart can see the savior Jesus. He knows Jesus can heal him, this is faith. Faith comes from heard and knew it. It is really understand Him.
Son of David is another name of Messiah.
How?
Can we see who is my savior? People do not know who id Jesus, I should preach gospel and have witness among people, let people know who is Jesus, what he can do to everyone.