The Kybalion

This concise work on 'The Hermetic Philosophy' outlines seven universal principles: Mentalism, Correspondence, Vibration, Polarity, Rhythm, Cause and Effect, and Gender. Rather than the actual Kybalion, this is purportedly an exegesis on that text. While this was probably one of the books which William Walker Atikinson wrote for the Yogi Publication Society under a pseudonym, it probably bears a closer read than most.