Meditations: A New Translation (Modern Library)

Control your perceptions. Direct your actions properly. Willingly accept what’s outside your control.

If you desire the virtues which are within your power, there is no room for envy or aping others. Instead of wishing to be a general, a congressman, or a celebrity, desire to be free. And the way to be free is to let go of anything that is not within your control.

“Our rational nature moves freely forward in its impressions when it: 1) accepts nothing false or uncertain; 2) directs its impulses only to acts for the common good; 3) limits its desires and aversions only to what’s in its own power; 4) embraces everything nature assigns it.” —MARCUS AURELIUS, MEDITATIONS

This last advice is really just an application of the broader Stoic belief that, as Epictetus puts it, “what upsets people is not things themselves but their judgments about these things.”8 To better understand this claim, suppose someone deprives me of my property. He has done me harm only if it is my opinion that my property had real value.