Even while each living thing is said to be alive and to be the same—as a person is said to be the same from childhood till he turns into an old man—even then he never consists of the same things, though he is called the same, but he is always being renewed and in other respects passing away, in his hair and flesh and bones and blood and his entire body. And it's not just in his body, but in his soul too, for none of his manners, customs, opinions, desires, pleasures, pains, or fears ever remains the same, but some are coming to be in him while others are passing away.… And in that way everything mortal is preserved, not, like the divine, by always being the same in every way, but because what is departing and aging leaves behind something new, something such as it had been.