It is one of the favorable signs of the times, that the existence of this important element of our nature begins to be generally recognized. Philosophy, though lingering long, has at last come to the aid of religion. She endeavored to solve the problems of human nature, without admitting this principle; but found herself unable to do it. Men of literature, men of philosophic inquiry, unite in acknowledging, not merely the existence of faith, but its mighty influence, even when considered out of its religious relations. As men of observation and thought, they see clearly, that there are a multitude of facts in human history, both individual and national, which preclude altogether any satisfactory explanation, except on the ground of its existence and its great power. And these men, men whose testimony is weighty, and whose concurrence every good man would desire, begin to look, in consequence of the advance of their philosophy, with a more favorable eye on religion. They found the Bible filled with declarations in relation to faith, which they did not understand; declarations which they found no where else, and which they hesitated to receive. But it is now no longer a matter of surprise, that a principle should effect so much in religion, which is seen and acknowledged to be so powerful in nature.
— edited from The Life of Faith (1853) Part 1, Chapter 2.