"All collective undertakings require trust. From the games that children play to complex social institutions, humans cannot work together unless they suspend their suspicion of one another. One person holds the rope, another jumps. One person steadies the ladder, another climbs. Why? In part because we hope for reciprocity, but in part from what is clearly a natural propensity to work in cooperation to collective advantage."

Tony Judt, Ill Fares the Land (2010)