Evolution and Rhythm are in almost perfect agreement with the Hermetic Teachings regarding the Principle of Rhythm. So, the student of Hermetics need not lay aside any of his cherished scientific views regarding the Universe. All he is asked to do is to grasp the underlying principle of "THE ALL is Mind; the Universe is Mental--held in the mind of THE ALL." He will find that the other six of the Seven Principles will "fit into" his scientific knowledge, and will serve to bring out obscure points and to throw light in dark corners. This is not to be wondered at, when we realize the influence of the Hermetic thought of the early philosophers of Greece, upon whose foundations of thought the theories of modern science largely rest. The acceptance of the First Hermetic Principle (Mentalism) is the only great point of difference between Modern Science and Hermetic students, and Science is gradually moving toward the Hermetic position in its groping in the dark for a way out of the Labyrinth into which it has wandered in its search for Reality. The purpose of this lesson is to impress upon the minds of our students the fact that, to all intents and purposes, the Universe and its laws, and its phenomena, are just as REAL, so far as Man is concerned, as they would be under the hypotheses of Materialism or Energism. Under any hypothesis the Universe in its outer aspect is changing, ever-flowing, and transitory--and therefore devoid of substantiality and reality. But (note the other pole of the truth) under the same hypotheses, we are compelled to ACT AND LIVE as if the fleeting things were real and substantial. With this difference, always, between the various hypotheses--that under the old views Mental Power was ignored as a Natural Force, while under Mentalism it becomes the Greatest Natural Force. And this one difference revolutionizes Life, to those who understand the Principle and its resulting laws and practice.