"In a slumbering church it is the adversary's great business to rock the cradle, hush all noise, and drive away even a fly which might light upon the sleeper's faced; Satan's great dread is lest the church should be aroused from her dreamy slumbers."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