Attributed to Szent-Györgyi in "Bridging the Present and the Future: IEEE Professional Communication Society Conference Record, Williamsburg, Virginia, October 16-18, 1985", p. 14, 1985.
Stephen R. Covey (2015). “The Stephen R. Covey Interactive Reader - 4 Books in 1: The 7 Habits of Highly Effective People, First Things First, and the Best of the Most Renowned Leadership Teacher of our Time”, p.98, Mango Media Inc.