The last proceeding of reason is to recognize that there is an infinity of things which are beyond it.

Pascal, Blaise. "Pensées." Pensées and Other Writings, edited by Anthony Levi, translated by Honor Levi. Oxford University Press, 2008, no. 1.

La Fontaine, Jean. "The Oak and the Reed." The Complete Fables of Jean de La Fontaine, translated by Norman R. Shapiro. University of Illinois Press, 2007, bk. 1, no. 22.

Luther, Martin. The Table Talk of Martin Luther, edited by Thomas S. Kepler. Dover Press, 2005.

Voltaire. Candide, edited by Nicholas Cronk. W. W. Norton & Company, 2016, ch. 12.