Be thou erect, or be made erect. Just as it is with the members in those bodies which are united in one, so it is with rational beings which exist separate, for they have been constituted for one co-operation. And the perception of this will be more apparent to thee, if thou often sayest to thyself that I am a member (melos) of the system of rational beings. But if (using the letter r) thou sayest that thou art a part (meros) thou dost not yet love men from thy heart; beneficence does not yet delight thee for its own sake; thou still doest it barely as a thing of propriety, and not yet as doing good to thyself.
Whether the universe is a concourse of atoms, or nature is a system, let this first be established, that I am a part of the whole which is governed by nature; next, I am in a manner intimately related to the parts which are of the same kind with myself. For remembering this, inasmuch as I am a part, I shall be discontented with none of the things which are assigned to me out of the whole; for nothing is injurious to the part, if it is for the advantage of the whole. For the whole contains nothing which is not for its advantage; and all natures indeed have this common principle, but the nature of the universe has this principle besides, that it cannot be compelled even by any external cause to generate anything harmful to itself. By remembering, then, that I am a part of such a whole, I shall be content with everything that happens. And inasmuch as I am in a manner intimately related to the parts which are of the same kind with myself, I shall do nothing unsocial, but I shall rather direct myself to the things which are of the same kind with myself, and I shall turn an my efforts to the common interest, and divert them from the contrary. Now, if these things are done so, life must flow on happily, just as thou mayest observe that the life of a citizen is happy, who continues a course of action which is advantageous to his fellow-citizens, and is content with whatever the state may assign to him.