The most important thing a man can know is that, as he approaches his own door, someone on the other side is listening for the sound of his footsteps.

Clark Gable (1901-1960) American film actor [b. William Clark Goebel]
(Attributed)

In Ronald Reagan, Where's the Rest of Me?, ch. 18 (1965). Quoted as something Reagan wrote to his first son, Michael, before his marriage. Alternately given as, "There is no greater happiness for a man than approaching a door at the end of the day knowing someone on the other side of the door is waiting for the sound of his footsteps," in Julia Baumgold, "Ronald Reagan's Total Woman," New York Magazine, 28 Jul 1980.