“I am not suited to the role of going around selling the life-can-be-beautiful idea. It can be, indeed. But you don't buy the concept from your friendly door-to-door lecture salesman.”

Is It Bill Bailey? (TV, 1998)

1960s, Why Jesus Called A Man A Fool (1967)

Se me abre una puerta, entro y me hallo con cien puertas cerradas.
Voces (1943)

Source: The Lightning Thief

Source: The Power of Myth (book), p. 120
Context: Moyers: Do you ever have the sense of... being helped by hidden hands?
Campbell: All the time. It is miraculous. I even have a superstition that has grown on me as a result of invisible hands coming all the time — namely, that if you do follow your bliss you put yourself on a kind of track that has been there all the while, waiting for you, and the life that you ought to be living is the one you are living. When you can see that, you begin to meet people who are in your field of bliss, and they open doors to you. I say, follow your bliss and don't be afraid, and doors will open where you didn't know they were going to be.

As quoted in "Star Wars Breakout Kelly Marie Tran on The Last Jedi and Kylo Ren’s Shirtless Scene" in Vulture (20 December 2017) https://www.vulture.com/2017/12/kelly-marie-tran-on-the-last-jedi-and-shirtless-kylo-ren.html

Geneva, Switzerland, September 8, 1978
1970s

Source: The Tales of Alvin Maker, The Crystal City (2003), Chapter 12 “Springfield” (p. 250).