Luke 5:12
While Jesus was in one of the towns, a man came along who was covered with leprosy. When he saw Jesus, he fell with his face to the ground and begged him, Lord, if you are willing, you can make me clean — the leper covered with leprosy (in Luke's medical observation, he is at an advanced stage) approaches Jesus in the posture of prostration and desperation. If you are willing, you can make me clean: the same petition as in Mark 1:40 — the distinction between willingness and ability, the confident faith in Jesus' power combined with uncertainty about his intention.