Learn it → Apply it → Save as Skill
Some things are within your power. Almost everything else is not. Your judgments, effort, choices and reactions are yours to direct. Other people, outcomes, luck and the past are not, however much they concern you. Suffering concentrates wherever this line gets blurred.
The Dr. Wallace’s Favorite Mental Models is designed to turn useful ways of thinking into reusable tools. Each model gives you a fast visual overview, deeper interactive learning, practical application exercises and an AI-ready Markdown skill you can save for future use.
Instead of merely reading about mental models, you can gradually build your own AI skills library: a collection of portable reasoning skills that can help ChatGPT, Claude, Grok and other AI assistants apply the mental models you value.
When a situation troubles you, split it into what is actually within your power and what is not. Then act fully on the first part and release your grip on the second, without pretending you do not care.
Your judgments, effort, preparation, choices, words, and how you respond.
Other people’s choices, outcomes, timing, luck, the past, and what anyone thinks of you.
Important: most real situations are a mix of both columns. The skill is separating them accurately, not assuming everything sits on one side.
The model is most useful when a person, an outcome, or a piece of news is occupying attention that could instead go toward something actually within reach.
The dichotomy of control is a sorting practice, repeated on purpose whenever a situation starts to feel heavier than it should.
Name the situation, worry, or decision that is occupying your attention right now.
List its parts. Mark each one: yours to direct, or not yours to direct.
Put your full effort and attention onto the “yours” items, and only those.
Consciously loosen your grip on the “not yours” items, without denying that they matter to you.
Open a use case to see what the model changes.
Separate your preparation, evidence, and delivery (yours) from the buyer’s budget, timing, and internal politics (not yours). Improve what is yours for next time; stop replaying what was never yours to decide.
Your contract terms, your escalation, and your contingency plan are yours. The vendor’s internal capacity is not. Act on the first set instead of running the same frustrated conversation about the second.
Your honesty, your boundaries, and your continued presence are yours. Their decision is not. Say what is true for you once, clearly, then release the urge to control the outcome.
Lesson quality, feedback, and patience are yours. The student’s effort and home circumstances are not. Keep improving your part without treating their part as a verdict on your teaching.
Build quality, onboarding, and responsiveness to feedback are yours. A competitor’s pricing or a user’s changing needs are not. Keep shipping on the first list; stop treating the second as a personal failure.
Your track record, your case, and how you ask for feedback are yours. The committee’s decision and internal politics are not. Use the feedback that is available; do not relitigate a decision you cannot reopen.
This is an illustrative example designed to teach the method.
The research behind the proposal • how clearly you presented it • the questions you prepared for • your tone under pushback • what you do next
The board’s existing priorities • budget constraints set before you walked in • one member’s unrelated bad day • the final vote itself
Expand for the distinction between what Epictetus actually wrote and the modern label attached to it.
Epictetus (c. 50–135 CE) was born into slavery in Hierapolis, Phrygia, was later freed, and taught Stoic philosophy first in Rome and then in Nicopolis, Greece. He wrote nothing himself; his teachings survive because his student Arrian transcribed them into the Discourses and a short handbook, the Enchiridion, compiled in the early second century CE.
No. The Enchiridion opens by dividing things into what is “up to us” (eph’ hemin) and what is “not up to us” (ouk eph’ hemin), naming judgment, impulse, desire and aversion as the first group, and body, property, reputation and office as the second. “Dichotomy of control” is the modern label scholars and popularizers, including William B. Irvine in “A Guide to the Good Life” (2008), use for this distinction.
Locus of control is a related but separate concept from twentieth-century psychology, introduced by Julian Rotter in 1954, describing whether a person tends to attribute outcomes to their own actions (internal) or to outside forces (external) as a general personality trait. The Stoic dichotomy of control is a deliberate practice applied situation by situation, not a measured personality trait, though the two ideas are often discussed together.
Effort and preparation are yours; the result is not. A good decision can still produce a bad outcome, and that gap is not evidence of failure.
“Not up to me” can quietly become an excuse to disengage from a part of the situation that actually was yours, such as your preparation or your follow-through.
You cannot control whether someone forgives you, but your actions still influence the odds. Releasing control is not the same as giving up all effort.
The goal is to stop suffering over what you cannot change, not to stop caring about people or outcomes. Indifference is not the point.
“My career” is too large a unit to sort in one move. Break it into components: your skill-building is yours, a hiring committee’s decision is not.
“That is not my problem” can misuse the model when your own actions genuinely affected someone else. Sort honestly, not conveniently.
the situation is genuinely still open and your continued effort changes the odds. Do not release your grip prematurely on something still in motion.
the problem requires organizing with other people. Individual acceptance is not a substitute for coordinated effort where one is actually needed.
the outcome resulted from a controllable choice you made. Review it plainly instead of filing it under “not up to me.”
This browser tool structures your thinking. It does not send your information anywhere or perform AI analysis.
Save as Skill converts the model into portable Markdown instructions that teach an AI when and how to apply the dichotomy of control, what questions to ask, what mistakes to avoid, and how to structure its response.
Save the skills you find useful and organize them into your own reusable library. The Markdown is intentionally model-neutral, so it can be used wherever an AI system accepts uploaded files, project knowledge, custom instructions or reusable text context. Platform capabilities differ, so this is a portable skill file rather than a claim of one-click installation.
No. The practice separates effort from outcome so you can care fully about the outcome while not making your peace of mind depend on it. Epictetus’s own framing was about where to place your effort, not about becoming indifferent to people or results.
He meant the interpretation you attach to an event, not the event itself. Two people can face the same rejection and respond very differently, because the meaning assigned to it, not the event, is what is actually within a person’s power to direct.
No. Positive thinking often asks you to reframe an outcome as good. The dichotomy of control does not ask you to reframe the outcome at all. It asks you to stop placing your effort and identity on something that was never yours to determine, whatever that outcome turns out to be.