It is in the love of one's family only that heartfelt happiness is known.
(Thomas Jefferson (1743-1826), U.S. president. Letter, October 26, 1801, to his daughter, Mary Jefferson Eppes. The Family Letters of Thomas Jefferson, p. 211, eds. E.M. Betts and J.A. Bear, Jr. (1966).)
I suspect there isn't an actor alive who was able to truthfully answer his family's questions after his first day's activity in his future profession.
(Simone Signoret (1921-1985), French movie actor. Nostalgia Isn't What It Used to Be, ch. 3 (1976).
Referring to the dull and unpleasant, rather than glamorous, nature of a movie actor's first day of work.)