I take it that the highest proof of Christ's power is not that He offers salvation, not that He bids you take it if you will, but that when you reject it, when you hate it, when you despise it, He has a power whereby he can change your mind, make you think differently from your former thoughts, and turn you from the error of your ways.
Sermons of Rev. C.H. Spurgeon of London... (ed. 1883)