Modern thought and modes of living have been immeasurably influenced by the philosophers of the Enlightenment men such as Descartes, Hobbes, Spinoza, Newton, Leibniz, and Locke. Gathered together in this book and preceded by valuable biographical sketches are selections from the basic and most significant writings of each of these men."

The philosophic search for truth has been evident in all ages and among all peoples. The developments of each generation require new philosophies and the recasting of old ones. The eighteenth century was no exception, and the scientific advances of the times brought about many innovations in philosophic thought. At a time when scientists were reducing certain phenomena of the natural world to expressions of a few simple mathematical laws, men such as Berkeley, Hume, and Kant were trying to discover how far and on what basis human reason could be applied with similar success in other fields....