"I have heard say that the depths of a Scotch loch corresponds to the height of the surrounding mountans. So deep thy sense of obligation for pardoned sin, so high thy love to him who has forgiven thee" - From 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