Does trust grow fragile when people are too rational or when they are not rational enough? Both thoughts are plausible. The first upholds local values against reason. The second argues that rational people can trust and be trusted. Which is right turns on how we define OreasonO. Martin Hollis argues for an interpretation of OreasonO as putting the common good before oneOs own. This offers a universal reciprocity to people who then choose what reason shall mean for them.