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

Delphi Collected Works of Baruch Spinoza (Illustrated)

The Critique of Practical Reason

Meditations on First Philosophy & Other Metaphysical Writings

The Culmination

Arrows of Freethought

Essays Upon Some Controverted Questions

Why I Do Not Believe in God

A Brief History of Modern Philosophy

Superstition In All Ages

A Plea for Atheism

A Grammar of Freethought