Jowett: principle of change

Ath. And we will assume that which moves other, and is changed by other, to be the ninth, and that which changes itself and others, and is co-incident with every action and every passion, and is the true principle of change and motion in all that is — that we shall be inclined to call the tenth. LAWS BOOK X

Ath. Then we must say that self-motion being the origin of all motions, and the first which arises among things at rest as well as among things in motion, is the eldest and mightiest principle of change, and that which is changed by another and yet moves other is second. LAWS BOOK X

Ath. Then all things which have a soul change, and possess in themselves a principle of change, and in changing move according to law and to the order of destiny : natures which have undergone a lesser change move less and on the earth’s surface, but those which have suffered more change and have become more criminal sink into the abyss, that is to say, into Hades and other places in the world below, of which the very names terrify men, and which they picture to themselves as in a dream, both while alive and when released from the body. And whenever the soul receives more of good or evil from her own energy and the strong influence of others — when she has communion with divine virtue and becomes divine, she is carried into another and better place, which is perfect in holiness ; but when she has communion with evil, then she also changes the Place of her life. LAWS BOOK X