“Furthermore, we have not even to risk the adventure alone; for the heroes of all time have gone before us; the labyrinth is thoroughly known; we have only to follow the thread of the hero-path. And where we had thought to find an abomination, we shall find a god; where we had thought to slay another, we shall slay ourselves; where we had thought to travel outward, we shall come to the center of our own existence; and where we had thought to be alone, we shall be with all the world.”

― Joseph Campbell, The Hero With a Thousand Faces

Books by Joseph Campbell:

The Power of Myth

The Hero with a Thousand Faces

Stephen Press Field:

The War of Art: Break Through the Blocks and Win Your Inner Creative Battles

Seth Godin:

The Practice: Shipping Creative Work

Carl Jung:

Man and His Symbols.