“Leave the door open for the unknown, the door into the dark. That’s where the most important things come from, where you yourself came from, and where you will go.”

Source: Illusions : The Adventures of a Reluctant Messiah (1977)

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.

Variant: Follow your bliss and doors will open where there were no doors before.
Source: The Power of Myth

2000s
Context: No matter who you are, engaging in the quest to discover where and how things began tends to induce emotional fervor—as if knowing the beginning bestows upon you some form of fellowship with, or perhaps governance over, all that comes later. So what is true for life itself is no less true for the universe: knowing where you came from is no less important than knowing where you are going.

Source: The Invention of Wings

Source: Eric

Source: Wise Blood