What I’m trying to illustrate, Anastasia, is that a lust for power will poison your mind. It strengthens you … but bends your sense of what should be traded. Be careful what you allow to shape you. Ruling is a responsibility, and a heavy one. It’s what we owe to the people, not what they owe to us.”
In sum, "with great power comes great responsibilities" - uncle ben (or aunt may, depending on the multiverse)