Original works
- From Shakespeare to Existentialism
- Existentialism: From Dostoevsky to Sartre
- Critique of Religion and Philosophy
- Tragedy and Philosophy
- Hegel: A Reinterpretation
- https://archive.org/details/faithofaheretic012669mbp The Faith of a Heretic: What Can I Believe? How Should I Live? What Do I Hope?
- Without Guilt and Justice: From Decidophobia to Autonomy
- Cain and Other Poems
- Existentialism, Religion, and Death: Thirteen Essays
- The Future of the Humanities
- Religions in Four Dimensions
- Discovering the Mind, a trilogy consisting of
- Goethe, Kant, and Hegel
- Nietzsche, Heidegger, and Buber
- Freud Versus Adler and Jung
- Man's Lot: A Trilogy, consisting of
- Life at the Limits
- Time is an Artist
- What is Man?