Marcus Aurelius: it is not thine, but another man's sin.…

Someone else’s bad behavior is theirs to answer for. You do not need to carry it around as your personal moral emergency. This is especially hard when the wrongdoing is close to home: a colleague is careless, a family member is manipulative, someone gets rewarded for cutting corners. We feel compelled to replay it, prosecute it in our heads, and let it poison our day. Marcus reminds us that resentment does not correct another person’s character. It only gives their mistake a second victim. This does not mean ignoring harm or refusing to set limits. Report the misconduct, have the conversation, protect yourself and others where you can. Then release the fantasy that your agitation is a form of justice. Your responsibility is your own response. Today, when another person’s choices occupy too much of your mind, ask what practical action is available—and what mental burden is simply not yours.