"The cave you fear to enter holds the treasure you seek" is a famous quote by Joseph Campbell, meaning personal growth and valuable rewards (the "treasure") are found by confronting your deepest fears, challenges, and the unknown aspects of yourself (the "cave"), leading to self-discovery and achieving your true potential.
It's about stepping outside your comfort zone to find what you truly desire, often hidden within what scares you most, like unresolved emotions or new paths.
That's one of the things the Abundance GPS guides you with.