Meditations by Marcus Aurelius Book 4 Page 7

and alterations in the world thou thyself hast already been an eyewitness of in thy time. This world is mere change, and this life, opinion.

IV. If to understand and to be reasonable be common unto all men, then is that reason, for which we are termed reasonable, common unto all.

If reason is general, then is that reason also, which prescribeth what is to be done and what not, common unto all. If that, then law. If law, then are we fellow-citizens. If so, then are we partners in some one commonweal. If so, then the world is as it were a city. For which other commonweal is it, that all men can be said to be members of? From this common city it is, that understanding, reason, and law is derived unto us, for from whence else? For as that which in me is earthly I have from some common earth;