The traditional belief that willpower is an inborn trait…
The traditional belief that willpower is an inborn trait that you either have a lot of or you don't (but cannot do much about it either way) is false. Instead, self-control skills, both cognitive and emotional, can be learned, enhanced, and harnessed so that they become automatically activated when you need them.
— from The Heart in the Cockpit (Emotion/Awe/Anxiety/Regret/Empathy) · Marshmallow Test: Why Self-Control is the Engine of Success by Walter Mischel