You can buy a man’s time; you can buy a man’s physical presence at a given place; you can even buy a measured number of skilled muscular motions per hour or day. But you cannot buy enthusiasm; you cannot buy initiative; you cannot buy loyalty; you cannot buy the devotion of hearts, minds and souls. You have to earn those things.
Clarence Francis (1888–1985) American business executive, food industry consultant
“The Causes of Industrial Peace,” speech, National Association of Manufacturers (4 Dec 1947)
(Source)
Sometimes titled "Philosophy of Management".

