Leaves of Grass

by Walt Whitman

Tao Te Ching

by Lao Tzu

The Alchemist

by Paulo Coelho

The Heart Sutra (Prajnaparamita Hridaya)

by Attributed to Nagarjuna (compiled ~1st–4th century CE)

The Power of Myth

by Joseph Campbell

The Power of Now

by Eckhart Tolle

The Red Book

by Carl Jung