This is not to assume, on the other hand, that risk and the grounds for trust will be weighed up rationally before doing anything. Trust can also be shown to be thoughtless, careless and routinized, and thus to require no unnecessary expenditure of consciousness especially if expectation approaches certainty. One who goes unarmed among his fellow human beings puts trust in them, and does not nowadays seriously weigh up the alternative of carrying a sword or pistol. Trust merges gradually into expectations of continuity, which are formed like firm guidelines by which to conduct our everyday lives. But not all expectations of this nature involve trust; only those concerning conduct do so, and among the latter only those in the light of which one commits one's own actions and which if unrealized will lead one to regret one's behaviour.

XREF: Connects to sociological work on tacit knowledge and habitus — Giddens' structuration theory and Bourdieu's practical sense address similar unexamined expectations.

Niklas Luhmann, Trust and Power, loc. 146