"I bear my willing witness that I owe more to the fire, and the hammer, and the file, than to anything else in my Lord's workshop. I sometimes question whether I have learned anything, except through the rod. When my school room is darkened, I see most" Spurgeon's Sermon Notes
Further recommended reading & listening:
The Best of The Daily Spurgeon
The Forgotten Spurgeon, by Iain Murray
A Defense of Calvinism - by Charles Spurgeon