Willpower Depletion
https://www.youtube.com/watch?v=k2Wcu6aGyz8&feature=share Willpower depletion (or Ego Depletion) is the idea that willpower is a finite mental resource.
- use less willpower not more
- we don't have infinite willpower
- as you exert, it deplets
- devoid yourself of tempting situation that require willpower
However, an article [vox.com] by Vox reports that many famous experiments in Psychology have now been found to be false or in serious reevaluation. So, Ego Depletion (or Willpower Depletion) is under reevaluation. More about that can be found in an article about replication crisis in psychology [vox.com].