XLI. (120) Again, the things which are judged of by the best of the senses, sight, partake of number according to their kind. For the things which are seen are seven; body, distance, shape, magnitude, colour, motion, tranquillity, and besides these there is nothing. (121) It also happens that all the changes of the voice amount to seven; the acute, the grave, the contracted, in the fourth place the aspirated sound, the fifth is the tone, the sixth the long, the seventh the short sound. (122) There are also seven motions; the motion upwards, the motion downwards, that to the right, that to the left, the forward motion, the backward motion, and the rotatory motion, as is most especially shown by those who exhibit dances. (123) It is affirmed also that the secretions of the body are performed in the aforesaid number of seven. For tears are poured out through the eyes, and the purifications of the head through the nostrils, and through the mouth the saliva which is spit out; there are, besides two other channels for the evacuation of the superfluities of the body, the one being placed in front and the other behind; the sixth mode of evacuation is the effusion of perspiration over the whole body, and the seventh that most natural exercise of the generative powers. (124) Again, in the case of women, the flux called the catamenia, is usually carried on for seven days. Also, children in the womb receive life at the end of seven months, so that a very extraordinary thing happens: for children who are born at the end of the seventh month live, while those who are born at the expiration of the eighth month are altogether incapable of surviving. (125) Again, the dangerous diseases of the body, especially when lasting fevers, arising from the distemperature of the powers within us, attack us, are usually decided about the seventh day. For that day determines the contest for life, allotting safety to some men, and death to others.
XLII. (126) And the power of this number does not exist only in the instances already mentioned, but it also pervades the most excellent of the sciences, the knowledge of grammar and music. For the lyre with seven strings, bearing a proportion to the assemblage of the seven planets, perfects its admirable harmonies, being almost the chief of all instruments which are conversant about music. And of the elements of grammar, those which are properly called vowels are, correctly speaking, seven in number, since they can be sounded by themselves, and when they are combined with other letters, they make complete sounds; for they fill up the deficiency existing in semi-vowels, making the sounds whole; and they change and alter the natures of the mutes inspiring them with their own power, in order that what has no sound may become endowed with sound. (127) On which account it appears to me that they also originally gave letters their names, and acting as became wise men, did give the name to the number seven from the Respect{8}{the word used is sebasmos, as if hebdomas were derived from that; and the Romans formed septem from hepta, by the addition of s.} they had for it, and from regard to the dignity inherent in it. But the Romans, adding the letter S, which had been omitted by the Greeks, show still more conspicuously the correct etymological meaning of the word, calling it septem, as derived from semnos, venerable, as has been said before, and from sebasmos, veneration.
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