It has been said, by someone, that “the proper study of mankind is man.” I will not oppose the idea, but I believe it is equally true that the proper study of God’s elect is God. The proper study of a Christian is the Godhead. The highest science, the loftiest speculation, the mightiest philosophy which can ever engage the attention of a child of God is the name, the nature, the person, the work, the doings, and the existence of the great God whom he calls his Father. There is something exceedingly improving to the mind in a contemplation of the Divinity. It is a subject so vast that all our thoughts are lost in its immensity, so deep that our pride is drowned in its infinity. Other subjects we can compass and grapple with. In them, we feel a kind of self-content and go our way with the thought, “Behold. I am wise.” But, when we come to this master science, finding that our plumb-line cannot sound its depth and that our eagle eye cannot see its height, we turn away. . . – excerpted from “The Immutability of God,” a sermon on Malachi 3.6, preached by Charles Spurgeon on Sunday morning, January 7, 1855 (his first sermon as pastor of New Park Street Chapel, in London.) Spurgeon was 20 years old.