""The Divine nature, the filiation of the Son of God, the complex person of Jesus, the procession of the Holy Ghost, the eternal decrees, and so forth, are not so much to be understood as to be believed." - 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