Choose fairness over appetite
Principle 36 from the Enchiridion
Consider the relationship, not only your own appetite. What satisfies you personally may still be unfair to the people sharing the situation.
Original Passage
As the proposition, "Either it is day or it is night," is extremely proper for a disjunctive argument, but quite improper in a conjunctive one, so, at a feast, to choose the largest share is very suitable to the bodily appetite, but utterly inconsistent with the social spirit of an entertainment. When you eat with another, then, remember not only the value of those things which are set before you to the body, but the value of that behavior which ought to be observed towards the person who gives the entertainment.
Modern Interpretation
A common version of this is easy to recognize. Epictetus reminds us that an action can be useful to us and still be unfair in a shared setting. Living with other people means considering more than our own appetite.
The lesson goes well beyond food. Attention, credit, and opportunity also need to be shared fairly. Taking the largest portion may help us for a moment, but it can weaken trust. So the question is not only what benefits us, but what respects the people around us.
In Practice
A common version of this is easy to recognize. In a team project, your part is the most visible, so you could easily take most of the credit.
Name everyone's contribution accurately. You do not need to hide your own work, but you also do not need to make the rest disappear.
Reflection Question
In what shared situation are you most tempted to take more than your part?