"David Hume, the historian, philosopher, and skeptic, spent his life in traducing the Word of God. In his last moments he joked with those around him; but the intervals were filled up with sadness. He wrote: 'I am affrighted and confounded with the forlorn solitude in which I am place by my philosophy. When I turn my eye inward, I find nothing but doubt and ignorance. Where am I, and what? I begin to fancy myself in the most deplorable condition imaginable, environed in the deepest darkness.'" - Spurgeon's Sermon Notes
Recommended reading:
The Forgotten Spurgeon, by Iain Murray
A Defense of Calvinism - by Charles Spurgeon