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“The Immortal Principle was first called water by Thales. Anaximenes called it air. The Pythagoreans called it number and were thus the first to see the Immortal Principle as something nonmaterial. Heraclitus called the Immortal Principle fire and introduced change as part of the Principle. He said the world exists as a conflict and tension of opposites. He said there is a One and there is a Many and the One is the universal law which is immanent in all things. Anaxagoras was the first to identify the One as nous, meaning “mind.”
Parmenides made it clear for the first time that the Immortal Principle, the One, Truth, God, is separate from appearance and from opinion, and the importance of this separation and its effect upon subsequent history cannot be overstated. It’s here that the classic mind, for the first time, took leave of its romantic origins and said, “The Good and the True are not necessarily the same,” and goes its separate way. Anaxagoras and Parmenides had a listener named Socrates who carried their ideas into full fruition.”….

“It is an immortal dialogue, strange and puzzling at first, but then hitting you harder and harder, like truth itself. What Phædrus has been talking about as Quality, Socrates appears to have described as the soul, self-moving, the source of all things. There is no contradiction. There never really can be between the core terms of monistic philosophies. The One in India has got to be the same as the One in Greece. If it’s not, you’ve got two. The only disagreements among the monists concern the attributes of the One, not the One itself. Since the One is the source of all things and includes all things in it, it cannot be defined in terms of those things, since no matter what thing you use to define it, the thing will always describe something less than the One itself. The One can only be described allegorically, through the use of analogy, of figures of imagination and speech. Socrates chooses a heaven-and-earth analogy, showing how individuals are drawn toward the One by a chariot drawn by two horses.”