This is the first full-length English translation of Benjamin Constants massive study of humanitys religious forms and development, published in five volumes between 1824 and 1831. Constant (17671830) regarded On Religion, worked on over the course of many years, as perhaps his most important philosophical work. He called it the only interest, the only consolation of my life, and the book that I was destined by nature to write. While the recent revival of interest in Constants thought has been welcome and fruitful, it has been incomplete, tending to leave out of account his writings on...