[8] In the same way, as neither fire, nor earth, nor any one of the four elements, out of which the universe was created, are the world, but the meeting and mixture of all the elements together; in the same way also happiness ought not peculiarly to be sought for either in the external things, or in the things of the body, or in the things of the soul, taken by themselves; for each of the aforementioned things has only the rank of parts and elements, but it must be looked for in the combination of them all together.