"The quality of your thoughts" — Marcus Aurelius

The happiness of your life depends upon the quality of your thoughts.

Meditations, Book IV, 3

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Meditations by Marcus Aurelius

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Men are disturbed not by the things which happen, but by the opinions about the things.

Enchiridion, Chapter V

Seek not the good in external things; seek it in yourself.

Discourses, Book I

Take care not to be harmed by your own thoughts.

Enchiridion