“Master, I have brought unto Thee my son, which hath a dumb spirit; And wheresoever he taketh him, he teareth him: and he foameth, and gnasheth with his teeth, and pineth away: and I spake to Thy disciples that they should cast him out; and they could not.”…”…bring  him unto Me.” Mark 9:17-19

This man had for a long time considered his son’s case to be hopeless. Well he might. In addition to the fact that the child was subject to attacks of epilepsy and to extreme fits of fury, he was deaf and dumb, so that no intelligent expression of feeling could come from him: if at any time he felt stronger and better, he could not give his father a word of hope, he could not utter his gratitude for the sympathetic care that watched over him, neither could he hear any word of consolation which his father addressed to him.

Peradventure, there is one here, this morning, who has grown hopeless of salvation; he has felt as if his case was one out of the catalogue of mercy; he has written bitter things against himself, and supposed that God has sealed those bitter things and made them true; but you see the father in the presence of Christ believed over the head of his despair, “in hope believing against hope,” and I pray that you may do the same. In the presence of Christ the man’s confidence came back to him. Hast thou, my hearer, a hope that can do the same?…With Him nothing can be impossible. I see His pierced hands and feet, and feel that if He stooped to suffer in the sinner’s stead, the merit of His sacrifice must be beyond conception great. In Jesus the hopeless one hath hope, he who had despaired else now bids his heart be of good cheer. Oh, that is true faith which will not suffer itself to be any longer the slave of doubt and despondency now that it sees Jesus the Lord drawing near. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1033.cfm