" In this way, as it seems to me, he said: "One might make the same
argument about harmony, lyre and strings, that a harmony is something
invisible, without body, beautiful and divine in the attuned lyre, whereas
the lyre itself and its strings are physical, bodily, composite, earthy and
akin to what is mortal. Then if someone breaks the lyre, cuts or breaks
the strings and then insists, using the same argument as you, that the
harmony must still exist and is not destroyed because it would be impossi-
ble for the lyre and the strings, which are mortal, still to exist when the
strings are broken, and for the harmony, which is akin and of the same
nature as the divine and immortal, to be destroyed before that which is
mortal; he would say that the harmony itself still must exist and that the
wood and the strings must rot before the harmony can suffer. And indeed
Socrates, I think you must have this in mind, that we really do suppose
the soul to be something of this kind; as the body is stretched and held
together by the hot and the cold, the dry and the moist and other such
things, and OUR soul is a mixture and harmony of those things when they
are mixed with each other rightly and in due measure. "

― Plato , Phaedo