Great Philosophers Volume Two: Science and Philosophy, The Preservation of Youth, and Understanding History

Ethics

The Republic

The Will to Doubt

The Doors of Perception and Heaven and Hell

Spinoza's Ethics

Philosophy 101: From Plato and Socrates to Ethics and Metaphysics, an Essential Primer on the History of Thought

A Treasury of Albert Schweitzer

Beyond Good & Evil: Prelude to a Philosophy of the Future

The Selected Works of Baruch de Spinoza

On the Shortness of Life: Life Is Long if You Know How to Use It

The Art of Philosophizing: And Other Essays

The Gay Science: With a Prelude in Rhymes and an Appendix of Songs

Essays in Skepticism

The Genealogy of Morals

The Essential Baruch Spinoza: How to Improve Your Mind, The Road to Inner Freedom, and The Book of God

The Sayings of Socrates

The Book of God

The Trial and Death of Socrates: Four Dialogues

Ethics (Complete Edition)