Sefer HaIkkarim ("Book of Principles") is a fifteenth-century work by rabbi Joseph Albo, a student of Hasdai Crescas. It is an eclectic, popular work, whose central task is the exposition of the principles of Judaism. The work contains a number of internal contradictions. Most modern scholars see these as errors, while a minority of modern scholars see them as Albo's method for conveying esoteric messages.