"Satan must have thought much of Martin Luther. 'I could ride the world over,' says he, 'if it were not for that monk. He stands in my way. That strong headed man hates and mauls my first born son, the pope. If I could get rid of him I wouldn't mind though 50,000 smaller saints stood in my way." from Spurgeon's sermon Satan Considering the Saints)
Further recommended reading & listening:
The Best of The Daily Spurgeon
The Forgotten Spurgeon, by Iain Murray
A Defense of Calvinism - by Charles Spurgeon