Rationalism

Meditations of Marcus Aurelius

The Method, Meditations and Philosophy of Descartes

Six Metaphysical Meditations

The Jefferson Bible

Rules for the Direction of the Mind

Meditations on First Philosophy & Other Metaphysical Writings

The Critique of Practical Reason

Delphi Collected Works of Baruch Spinoza (Illustrated)

The Culmination

Why I Do Not Believe in God

Essays Upon Some Controverted Questions

Arrows of Freethought

A Brief History of Modern Philosophy

Superstition In All Ages

A Plea for Atheism

A Grammar of Freethought