And the LORD opened the eyes of the young man; and he saw: and behold, the mountain was full of horses and chariots of fire round about Elisha. – 2Kings 6:17

Think of Saul of Tarsus, how he harassed the church of Christ; but when the scales fell from his eyes, the Lord had no better servant under heaven than that once-furious persecutor. With both hands diligently he built up the church which once he labored to cast down. Pray, therefore, O my brethren, for our young men, who have sinned, that they may be restored; and for those who are as yet ignorant, that they may be enlightened; for the cause of God has need of these, and in these the church shall find her champions! Little know we the wealth of comfort for the faithful which may lie in one young life. Surely, we ought to pile on our prayers and make our intercession flame like some great beacon-light for the rising youth of our time. A blind man in the midst of such a world as this, what can he do? He cannot help other travelers, for he has to seek aid for himself. You wish to give rather than to take, do you not? Some here have great abilities, and I want them to use them aright. I am persuaded that I am speaking to young people whom God has ordained to be of great service to their age. That youth yonder does not as yet know what is in him. He is playing with himself; he is making a fool of himself; he is throwing his pearls before swine: he is wasting his strength. If the Lord should open his eyes, he would see what he is doing. What a man he would make if he were but right with God! We should pray for the blinded one, since he may terribly sin if not soon made to see. How capable of doing mischief is a man blinded by ignorance, by passion, by ambition, or by any other form of sin! Who knows the capacities for evil that lie within a single soul? Lord, open their eyes, that they may see! Lord, cause them to start back from the beginnings of sin, which are as the breaking out of the water-floods! O Savior, quench in them the spark of evil ere it grows into a fire, and rages to a conflagration! ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2215.cfm