In Sufi terms the crushing of the ego is called Nafs Kushi. And how do we crush it? We crush it by sometimes taking ourselves to task. When the self says, 'O no, I must not be treated like this,' then we say, 'What does it matter?' When the self says, 'He ought to have done this, she ought to have said that,' we say, 'What does it matter, either this way or that way? Every person is what he is; you cannot change him, but you can change yourself.' That is the crushing. ... It is only in this way that we can crush our ego.
Every passion, every emotion, has its effect upon the mind. Every change of mind, however slight, has its effect upon the body.
True power is not in trying to gain power; true power is in becoming power. But how to become power? It requires an attempt to make a definite change in oneself, and that change is a kind of struggle with one's false self.