Faith always implies the disbelief of a lesser fact in favor of a greater.
 Oliver Wendell Holmes Sr., The Professor at the Breakfast-Table (1860). copy citation

Context

“—The cut nails of machine-divinity may be driven in, but they won't clinch. —The arguments which the greatest of our schoolmen could not refute were two: the blood in men's veins, and the milk in women's breasts. —Humility is the first of the virtues—for other people. —Faith always implies the disbelief of a lesser fact in favor of a greater. A little mind often sees the unbelief, without seeing the belief of a large one. The Poor Relation had been fidgeting about and working her mouth while all this was going on. She broke out in speech at this point.” source