Introduction

Peter Adamson: In the City of God, Augustin claims that no one can doubt his own existence. He says it's a version of the most famous three-word Latin argument in the history of philosophy - cogito ergo sum, I think therefore I am. Adamson: Augustine discovered the anti-skeptical argument that would reappear centuries later in Descartes. The project of On the Trinity isAugustine's most philosophically ambitious work and the culmination of his lifelong quest to understand himself," he writes.