Meditations 11.21

He who has not one and always the same object in life, cannot be one and the same all through his life. But what I have said is not enough, unless this also is added, what this object ought to be. For as there is not the same opinion about all the things which in some way or other are considered by the majority to be good, but only about some certain things, that is, things which concern the common interest, so also ought we to propose to ourselves an object which shall be of a common kind [social] and political. For he who directs all his own efforts to this object, will make all his acts alike, and thus will always be the same.

Marcus Aurelius, Meditations 11.21, translated by George Long

He who has not ever in view one and the same goal of life cannot be throughout his life one and the same. Nor does that which is stated suffice, there needs to be added what that goal should be. For just as opinion as to all the things that in one way or another are held by the mass of men to be good is not uniform, but only as to certain things, such, that is, as affect the common weal, so must we set before ourselves as our goal the common and civic weal. For he who directs all his individual impulses towards this goal will render his actions homogeneous and thereby be ever consistent with himself.

Marcus Aurelius, Meditations 11.21, translated by C. R. Haines