One of the last books written by Samael Aun Weor, Revolutionary Psychology synthesizes a lifetime of work and expresses the beauty and terrors of the psychological revolution, the true basis of the path of spiritual regeneration. As the Buddha has his Dhammapada, and Jesus his Sermon on the Mount, so Samael Aun Weor has Revolutionary Psychology. This essential treatise is one of the most important resources for understanding the many details of the psychological work; without a solid and comprehensive understanding of esoteric psychology, one cannot progress in the work to Self-realize the Being. All things, all circumstances that occur outside ourselves, on the stage of this world, are exclusively the reflection of what we carry within. With good reason then, we can solemnly declare that the 'exterior is the reflection of the interior.' When someone changes internally and if that change is radical, then circumstances, life and the external also change.