Willpower

Key to self-control is not abstinence.It is reinforcement.

Abstinence will just make you more hungry.Reinforcement will keep the hunger at bay.

Abstinence equals to eternal monotony.Reinforcement equals to reward you earn for your hard work.

People work (whether they like to or not) for the rewards.May it be tangible or intangible.Nobody works for work itself.People use work as means to reach to an end.