Past Masters This link opens in a new windowThis series encompasses the largest collection of primary source full-text electronic editions in philosophy in the world. The series includes significant collections in the history of political thought and theory, religious studies, education, German studies, sociology, the history and philosophy of science, economics, and classics. Includes the works of Anselm, Aquinas, Augustine, Berkeley, Calvin, Kant, Kiergegard, Plato, and Wittgenstein among others.