…I received letters unto the brethren, and went to Damascus, to bring them which were there bound unto Jerusalem, for to be punished... suddenly there shone from heaven a great light round about me. – Acts 22:5,6

I remember being in Dr. John Campbell’s house, one day, when he told me that a minister was preaching at Whitefield’s old Tabernacle in Moorfields. One evening, when there were present, under very strange circumstances, two young men who had fallen into dissipated habits, and who had made an appointment with each other for the commission of some gross sin that very night…They were passing by the Moorfields Tabernacle and as they wanted to know the time at which they were to meet for this unholy purpose, one of them said to the other, “Go in, and see the time; there is sure to be a clock in there.” But the clock was not fixed as it is here, at the back of the preacher, but the other way; so, the young man had to go some little distance further in than he intended, in order to see the clock. If I remember rightly, the preacher that night was Matthew Wilks, and he was just uttering some quaint remark, something that arrested the young man’s attention, and held him fast in the aisle. His companion waited, outside for a time, but it was cold, so he thought he had better go in, and look at the clock himself, and fetch his friend out. He went in; the arrows of the Lord pierced the heart of both of them, and the second of those young men was John Williams, the famous missionary, and at last the martyr of Erromanga…You would not have thought it possible that those men should become, as they did, preachers of the gospel, when they were, at that very time, desperately set on the commission of a great sin against God, and their hearts were wholly given up to the pleasures and follies of this world; but so it happened, and our Lord still knows how to stop men as he stopped Saul of Tarsus on the road to Damascus…After such a triumph of divine grace, let us never despair of any sinner, however far he may have gone, into, sin. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2663.cfm