35 As he drew near to Jericho, a blind man was sitting by the roadside begging. 36 And hearing a crowd going by, he inquired what this meant. 37 They told him, “Jesus of Nazareth is passing by.” 38 And he cried out, “Jesus, Son of David, have mercy on me!” 39 And those who were in front rebuked him, telling him to be silent. But he cried out all the more, “Son of David, have mercy on me!” 40 And Jesus stopped and commanded him to be brought to him. And when he came near, he asked him, 41 “What do you want me to do for you?” He said, “Lord, let me recover my sight.” 42 And Jesus said to him, “Recover your sight; your faith has made you well.” 43 And immediately he recovered his sight and followed him, glorifying God. And all the people, when they saw it, gave praise to God.” (Luke 18:35-43)
The blind man calls Jesus “David’s Son.” This was a term for the Messiah. David’s Son, he would be David’s Son who would reclaim the throne for Israel, restore Israel to it’s former glory, do what the Messiah would do.
Earlier in his ministry Jesus would not let people refer to him in this manner. The disciples knew who he was, but they were to be silent about it. But now he does not silence the blind man, rather he confirms the blind man. Jesus is on his way to Jerusalem, where he will claim the throne of Israel, the cross from which he will rule the hearts of Israel in the forgiveness of sins. He goes to his death, but now he will let everyone know who they are dealing with. The Blind man calls him the Son of David, and he does precisely what the Son of David, the messiah is to do, he gives the blind their sight, and healing a blind man, opens the eyes of all to see their Messiah.