Whatsoever is now present, and from day to day hath its existence; all objects of memories, and the minds and memories themselves, incessantly consider, all things that are, have their being by change and alteration. Use thyself therefore often to meditate upon this, that the nature of the universe delights in nothing more, than in altering those things that are, and in making others like unto them. So that we may say, that whatsoever is, is but as it were the seed of that which shall be. For if thou think that that only is seed, which either the earth or the womb receiveth, thou art very simple.