Seek not the good in external things; seek it in yourself.
— Epictetus
Discourses, Book I
Inner Life
3 quotes on inner life from the Stoic tradition.
Very little is needed to make a happy life; it is all within yourself, in your way of thinking.
— Marcus Aurelius
Meditations, Book VII
The happiness of your life depends upon the quality of your thoughts.
— Marcus Aurelius
Meditations, Book IV