"If you have competence, you pretty much know its boundaries already. To ask the question (of whether you are past the boundary) is to answer it."

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Taking on responsibilities that properly belong to someone else means behaving irresponsibly toward yourself. You need to know where you end and someone else begins. You need to understand boundaries. You need to know what is and is not up to you, what is and is not in your control, what is and is not your responsibility.

— Nathaniel Branden