Religious

Philosophy of Contemporary Spirituality

Nature and the Gods

Gospel Philosophy

Arrows of Freethought

The Theistic Conception of the World

God the Known and God the Unknown

Was Man Created

The Philosophy of Natural Theology

Epistle to the Romans

Transcendentalism in New England

The Signature of All Things

An Examination of President Edwards' Inquiry into the Freedom of the Will

THE CONSOLATION OF PHILOSOPHY (Collector's Edition)

Pantheism, Its Story and Significance

Philosophy of the Plan of Salvation: A Book for the Times

Servetus and Calvin – Important Epoch in the Early History of the Reformation

The Analogy of Religion to the Constitution and Course of Nature

Lectures on the Proofs of the Existence of God

Life Everlasting

De Tribus Impostoribus, A. D. 1230: The Three Impostors