Metaphysics

Hegel: Lectures on Philosophy

Ethics

Life and Matter: A Criticism of Professor Haeckel's “Riddle of the Universe”

A Pluralistic Universe

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

Categories (Κατηγορίαι)

Sun-Clear Statement

Of the Nature of Things

God-Man

Ethics

Man or Matter

Phaedo

The Crest-Jewel of Wisdom

Philosophies

Human Immortality: Two Supposed Objections to the Doctrine

Introduction to the Philosophy and Writings of Plato

The Buried Temple

Sophist

THE CRITIQUE OF PURE REASON

An Enquiry Concerning Human Understanding