Religious

History of Free Thought in Reference to The Christian Religion

The History of Philosophy in Islam

The Conception of God

Who Are You, Really

How Reason Can Lead to God

A History of Western Philosophy

Epistemology

In Search of Moral Knowledge

Strange New World

The Rise and Triumph of the Modern Self

According to the Pattern (Romance Classic)

Marius the Epicurean

The Truth of Catholicism

The Varieties of Religious Experience

The Prophet

The Parable of Creation

The Natural History of Religion

Monism as Connecting Religion and Science

Man or Matter

Life's Basis and Life's Ideal: The Fundamentals of a New Philosophy of Life