To train successfully, you must be willing to sacrifice portions of your present self-concept to a future, higher version of the self created by your ego. It is your ego, god-like, that is initiating and driving the process of self-transformation and becoming. This process requires you to exchange something you have for something you want. Nothing worth anything is truly free, and everything worth having requires some kind of sacrifice.
Instead of “killing your ego” — instead of fighting yourself — approach training as a sacrifice of a part of yourself to a higher self.~ Jack Donovan from http://www.jack-donovan.com/axis/2016/08/all-training-is-sacrifice-stw-episode-18/