If you are able to face an enemy and not care what he does to you, then he cannot really hurt you. If you are able to say to a lover, "Do this or I`ll leave you," and your lover wants you to stay, then you have power; it`s that simple. If you are able to say to the judge, "Kill me if you want, I don`t care," and the judge doesn`t want to kill you, then you have the power. Now, it may be that the lover wants to leave you, and the judge probably does want to kill you, but if you can say, "I don`t care," that is a strength they cannot take away.
Of course, you must mean it.