I affirm, and the world declares it, unbelief is a sin. Is it not a sin for a creature to doubt the word of its maker? Is it not a crime and an insult to the Divinity for me, an atom, a particle of dust, to dare to deny His words? Is it not the very summit of arrogance and extremity of pride, for a son of Adam to say, even in his heart, “God, I doubt thy grace; I doubt thy love; I doubt thy power?” Oh! sirs, believe me, could you roll all sins into one mass; could you take murder, and blasphemy, and lust, and adultery and everything that is vile, and unite them all into one vast globe of black corruption, they would not equal then, the sin of unbelief. This is the monarch sin, the quintessence of guilt; the mixture of the venom of all crimes; the dregs of the wine of Gomorrah; it is the masterpiece of Satan; the chief work of the devil.—SPURGEON.
