Stoic Philosophy · Ancient Rome · Epictetus · Enchiridion
Make the best use of what is in your power, and take the rest as it happens.Epictetus — Enchiridion, c. 135 AD
The Enchiridion opens with one of the most consequential sentences in philosophical history: Some things are in our control and others not. In our control are opinion, pursuit, desire, aversion, and, in a word, whatever are our own actions. Not in our control are body, reputation, command, and, in one word, whatever are not our own actions. Epictetus spent the remaining forty-nine chapters of the book unpacking the implications of this distinction.
The practical application is daily and demanding. Before every situation that causes distress, the Stoic asks: which part of this is up to me? The answer is almost always narrower than it first appears. You cannot control whether you get the job, only how you prepare and present yourself. You cannot control how others receive your work, only the quality of the work itself. You cannot control illness, only your response to it. You cannot control loss, only what you do in its aftermath. Once the distinction is made clearly, the appropriate direction of energy becomes obvious: everything toward what is up to you, nothing wasted fighting what is not.
This is not passivity. Epictetus was one of the most engaged and active philosophers of his era — he ran a school, argued passionately, taught daily. The point is not to disengage from the world but to engage with it in the right direction. The athlete who focuses entirely on what is up to them — training, preparation, focus, recovery — performs better than the athlete who is also managing anxiety about outcomes they cannot control. The Stoic insight is that the same principle applies to every domain of life.
The dichotomy of control is the oldest and most durable piece of practical philosophy in the Western tradition. Epictetus developed it from earlier Stoic sources — Chrysippus, the third head of the Stoic school, had articulated a similar distinction — but Epictetus's formulation is the clearest and most complete.
What makes the concept remarkable is its universality across traditions. The Bhagavad Gita describes the same principle in different language: you have a right to perform your prescribed duties, but you are not entitled to the fruits of your actions. Do not consider yourself the cause of the results of your activities. The Buddhist concept of non-attachment points in the same direction: suffering arises from clinging to outcomes rather than engaging fully with process. The Tao Te Ching advises the sage to act without expectation, succeed without taking credit, and not dwell on the results.
Modern psychology has reached the same conclusion empirically. Internal locus of control — the belief that one's own actions determine outcomes — is among the most consistent predictors of achievement, wellbeing, and resilience across populations and cultures. The Stoics did not call it that. They called it the foundational discipline of philosophical practice. The content is identical.
It's not what happens to you, but how you react to it that matters.Epictetus — Discourses, c. 108 AD