Two of Leibniz's most studied works. Published in 1686, the Discourse on Metaphysics consists of the philosopher's explanation of individual perception as an expression of the rest of the universe from a unique perspective. The Monadology, written in 1714, offers a concise synopsis of Leibniz's philosophy, establishing the laws of final causes. Excerpted from Discourse on Metaphysics. Correspondence with Arnauld. Monadology, second edition, The Open Court Publishing Company, La Salle, Illinois, 1902.
Critique of Practical Reason by Immanuel Kant, Abbott, Thomas Kingsmill This 1788 work, based on belief in the immortality of the soul, established Kant as a vindicator of the truth of Christianity. It offers the most complete statement of his theory of free will.
