De Principiis, which contains Origen's views on various questions of systematic theology. The work has come down to us in the Latin translation of his admirer Rufinus; but, from a comparison of the few fragments of the original Greek which have been preserved, we see that Rufinus was justly chargeable with altering many of Origen's expressions, in order to bring his doctrine on certain points more into harmony with the orthodox views of the time. The De Principiis consists of four books, and is the first of the works of Origen in this series, to which we refer the reader.