On courage
Enter
The cave you fear to enter holds the treasure you seek.
Is there something important you keep avoiding?
Sources
Joseph Campbell · A Joseph Campbell Companion, p. 24 · paraphrase
A popular condensation of a related passage in A Joseph Campbell Companion: Reflections on the Art of Living (1991), p. 24. The Joseph Campbell Foundation cites the longer wording; this shorter form is not presented as verbatim.