I suppose there are some persons whose minds naturally incline towards the doctrine of free-will. I can only say that mine inclines as naturally towards the doctrines of sovereign grace. Sometimes, when I see some of the worst characters in the street, I feel as if my heart must burst forth in tears of gratitude that if God had left me alone and had not touched me by His grace, what a great sinner I should have been! I should have run to the utmost lengths of sin, dived into the very depths of evil, nor should I have stopped at any vice or folly, if God had not restrained me. I feel that I should have been a very king of sinners, if God had let me alone.
I cannot understand the reason why I am saved, except upon the ground that God would have it so. I cannot, if I look ever so earnestly, discover any kind of reason in myself why I should be a partaker of Diving grace. If I am not at this moment without Christ, it is only because Christ Jesus would have His will with me, and that will was that I should be with Him where He is, and should share His glory. I can put the crown nowhere but upon the head of Him whose mighty grace has saved me from going down into the pit. It was He who turned my heart, and brought me down on my knees before Him.
A Defense of Calvinism (eBook. www.spurgeongems.org) p. 1.