“Our results suggest that a broad assortment of actions make use of the same resource. Acts of self-control, responsible decision making, and active choice seem to interfere with other such acts that follow soon after. The implication is that some vital resource of the self becomes depleted by such acts of volition. To be sure, we assume that this resource is commonly replenished, although the factors that might hasten or delay the replenishment remain unknown, along with the precise nature of this resource.” – Baumeister et al., 1998, 1263f
