He who has not one and always the same object in life, cannot be one and the same all through his life.
 Marcus Aurelius, Meditations (c. 170 - 180). copy citation

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Author Marcus Aurelius
Source Meditations
Topic life
Date c. 170 - 180
Language English
Reference
Note Translated by George Long
Weblink https://www.gutenberg.org/files/15877/15877-h/15877-h.htm

Context

“and as we all live under universal Law, which commands both our body and our intelligence, and is the law of our nature, that is, the law of the whole constitution of a man, we must endeavor to discover what this supreme Law is. It is the will of the power that rules all. By acting in obedience to this will, we do justice, and by consequence everything else that we ought to do. 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” source