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reconciliation of opposites ; and I suppose that this must have been the meaning of Heracleitus, although his words are not accurate ; for he says that The One is united by disunion, like the harmony of the bow and the lyre. Now there is an absurdity in saying that harmony is discord or is composed of elements which are still in a state of discord. But what he probably meant was, that harmony is composed of differing notes of higher or lower pitch which disagreed once, but are now reconciled by the art of music ; for if the higher and lower notes still disagreed, there could be no har- mony, — clearly not. For harmony is a symphony, and sym- phony is an agreement ; but an agreement of disagreements while they disagree there cannot be ; you cannot harmonize that which disagrees. In like manner rhythm is compounded of elements short and long, once differing and now in accord ; which accordance, as in the former instance, medicine, so in all these other cases, music implants, making love and unison to grow up among them ; and thus music, too, is concerned with the principles of love in their application to harmony and rhythm. Again, in the essential nature of harmony and rhythm there is no difficulty in discerning love which has not yet become double. But when you want to use them in actual life, either in the composition of songs or in the correct performance of airs or metres composed already, which latter is called education, then the difficulty begins, and the good artist is needed. Then the old tale has to be repeated of fair and heavenly love— the love of Urania the fair and heavenly muse, and of the duty of accepting the temperate, and those who are as yet intemperate only that they may become tem- perate, and of preserving their love ; and again, of the vulgar Polyhymnia, who must be used with circumspection that the pleasure be enjoyed, but may not generate licentiousness ; just as in my own art it is a great matter so to regulate the desires of the epicure that he may gratify his tastes with- out the attendant evil of disease. Whence I infer that in music, in medicine, in all other things human as well as divine, both loves ought to be noted as far as may be, for they are both present.

The course of the seasons is also full of both these prin- ciples ; and when, as I was saying, the elements of hot and