Metaphysics

Facts of Consciousness

On the Heavens

What Is Reality

Groundwork of the Metaphysics of Morals

Proslogion

Introduction to the Philosophy and Writings of Plato

Parmenides

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

A Compendium on the Soul

A Pluralistic Universe

The Unreality of Time

A Neglected Argument for the Reality of God

Organon – Posterior Analytics