Humanism

A History of Freedom of Thought

The Principles of Secularism

Sartor Resartus, and On Heroes, Hero-Worship, and the Heroic in History

Creed and Deed: A Series of Discourses

Evolution and Ethics

Erasmus Against War

Why I Do Not Believe in God

Prisoner for Blasphemy

An ethical philosophy of life presented in its main outlines

A Plea for Atheism

The Positive Outcome of Philosophy

Atheism Among the People

The Story of My Mind; Or, How I Became a Rationalist

Morality Without God

Ingersollia Gems of Thought from the Lectures, Speeches, and Conversations of Col. Robert G. Ingersoll, Representative of His Opinions and Beliefs

Memory, History, Forgetting

The Essence of Christianity

The Chains We Cannot See

The philosophy of Elbert Hubbard

The Pleasures of Life