Luke 18:38-39

"Son of David" was a messianic title that expressed the man’s faith in Jesus as Israel’s Messiah (cf. Luke 1:27; Luke 1:32; 2 Samuel 7:8-16; Isaiah 11:1; Isaiah 11:10; Jeremiah 23:5-6; Ezekiel 34:23-24). Like the tax collector (Luke 18:13), he called out for mercy without claiming any merit. His insistence reflected his belief that Jesus could help him and his hope that Jesus would help him. Opposition only made him more adamant in his desire.