Our brain has a mechanism to put a halt on willpower use to

"Our brain has a mechanism to put a halt on willpower use to prevent it from hitting rock bottom. This is beneficial from an evolution point of view: You need to reserve some amount of willpower in the system for an emergency."
— Peak Self-Control

We have been bestowed with an evolutionary gift of the preservation of willpower; a safeguard and life-jacket if you will, against deplete moments in our lives.

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