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[991e] for it is necessary to explain it thus far: every diagram, and system of number, and every combination of harmony, and the agreement of the revolution of the stars must be made manifest as one through all1 to him who learns in the proper way, and will be made manifest if, as we say, a man learns aright by keeping his gaze on unity;


1 i.e. we must become aware of a single, unifying scheme of proportion running through geometrical figures and proportions (“diagrams”), arithmetical proportions (“systems of number”), harmonic proportions (“combinations of harmony”)—corresponding to square, line and cube referred to in 991a—and the rotations of the stars.

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    • R. G. Bury, The Symposium of Plato, 187C
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