Each tetrad gives the etymology of its subject, as an uttering or outering of the body physical or mental, and provides its anatomy in fourfold exegetical manner.
Marshall McLuhan
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And at once I saw with great clarity that human beings possess two bodies. One is the physical body, the other -- just as real, just as self-contained -- is the emotional body. Like the physical body, the emotional body reaches a certain level of growth, and then stops. But it stops rather sooner than the physical body. So most of us possess the emotional body of a retarded adolescent.
Colin Wilson
But no mental action seems necessary or invariable in its character. In whatever manner the mind has reacted under a given sensation, in that manner it is the more likely to react again; were this, however, an absolute necessity, habits would become wooden and ineradicable, and no room being left for the formulation of new habits, intellectual life would come to a speedy close. Thus, the uncertainty of the mental law is no mere defect of it, but is on the contrary of its essence. The truth is, the mind is not subject to "law," in the same rigid sense that matter is. It only experiences gentle forces which merely render it more likely to act a given way than it otherwise would be. There always remains a certain amount of arbitrary spontaneity in its action, without which it would be dead.
Charles Sanders Peirce
But the voice of anatomy, like the voice of all nature, never reaches the mental ear of the Great Commoner. It is the novel province of anatomy to tell the truth, the whole truth, and nothing but the truth about the structure, the origin and the history of man.
Henry Fairfield Osborn
The mental never influences the physical. It is always the physical that modifies the mental, and when we think that the mind is diseased, it is always an illusion.
Claude Bernard
Ten is the very nature of number. All Greeks and all barbarians alike count up to ten, and having reached ten revert again to the unity. And again, Pythagoras maintains, the power of the number 10 lies in the number 4, the tetrad. This is the reason: if one starts at the unit (1) and adds the successive number up to 4, one will make up the number 10 (1+2+3+4 = 10). And if one exceeds the tetrad, one will exceed 10 too.... So that the number by the unit resides in the number 10, but potentially in the number 4. And so the Pythagoreans used to invoke the Tetrad as their most binding oath: "By him that gave to our generation the Tetractys, which contains the fount and root of eternal nature..."
Pythagoras
McLuhan, Marshall
McManners, Joseph
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