…but they cried the more, saying, Have mercy on us, O Lord, Thou Son of David. – Matthew 20:31

“Two blind men sat by the wayside begging, and when they heard that Jesus passed by, they said, ‘O Lord, Thou Son of David, have mercy on us.'” Jesus stood still, called them, questioned them, and they seem to have had full conviction that He both could and would restore their sight, so Jesus had compassion on them, touched their eyes, and immediately they received sight.

Yes, and what a lesson this is for any here present who have a like conviction. Do you believe that Christ can heal you? Do you believe that He is willing to heal you? Then let me assure you that a channel of communication is opened between Him and you, for He is moved with compassion towards you, and already I hear Him command you to come to Him. He is ready to heal you now. The sad condition of a blind man should always move pity in the breast of the humane, but a glance at these two poor men-I do not know that there was anything strange or uncommon about their appearance-touched the Saviour’s sensibility. And when He heard them say that they did believe He could heal them, He seemed to perceive that they had inward sight, and to account it a pity that they should not have outward sight too. So at once He put His fingers upon their eyes, and they received the power of seeing. O soul, if thou believest Christ can save thee, and if you wilt now trust in Him to save thee, be of good cheer, thou art saved; that faith of thine hath saved thee. The very fact that thou believest that Jesus is the Christ, and doth rely upon Him, may stand as evidence to thee that thou art forgiven, that thou art saved. There is no let or bar to thy full redemption. Go thy way and rejoice in thy Lord. He hath compassion on thee. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3438.cfm