can exist between things whilst they are dissimilar; but probably he meant that from sounds which first differed, like the grave and the acute, and which afterwards agreed, harmony was produced according to musical art. For no harmony can arise from the grave and the acute whilst yet they differ. But harmony is symphony: symphony is, as it were, concord. But it is impossible that concord should subsist between things that differ, so long as they differ. Between things which are discordant and dissimilar there is then no harmony. A rhythm is produced from that which is quick, and that which is slow, first being distinguished and opposed to each other, and then made accordant; so does medicine, no less than music, establish a concord between the objects of its art, producing love and agreement between adverse things.
"Music is then the knowledge of that which relates to love in harmony and system. In the very system of harmony and rhythm, it is easy to distinguish love. The double love is not distinguishable in music itself; but it is required to apply it to the service of mankind by system and harmony, which is called poetry, or the composition of melody; or by the correct use of songs and measures already composed, which is called discipline; then one can be distinguished from the other, by the aid of an extremely skilful artist. And the better love ought to be honoured and preserved for the sake of those who are virtuous, and that the nature of the vicious may be changed through the inspiration of its spirit. This is that beautiful Uranian love, the attendant on the Uranian muse: the Pandemian is the attendant of Polyhymnia; to whose influence we should only so far subject ourselves, as to derive pleasure from it without indulging to excess; in the same manner as, according to our art, we are instructed to seek the pleasures of the table, only so far as we can enjoy them without the consequences of disease. In music, therefore, and
