Ranging from his early treatises, the Monologion (a work written to show his monks how to meditate on the divine essence) and the Proslogion (best known for its advancement of the so-called ontological argument for the existence of God), to his three philosophical dialogues on metaphysical topics such as the relationship between freedom and sin, and late treatises on the Incarnation and salvation, this collection of Anselm's essential writings will be a boon to students of the history of philosophy and theology as well as to anyone interested in examining what Anselm calls "the reason of faith.