Certes, they been lye to hounds, for an hound when he cometh by the roses, or by other bushes, though he may nat pisse, yet wole he heve up his leg and make a countenance to pisse. – Chaucer

Habit is thus the enormous flywheel of society, its most precious conservative agent. It alone is what keeps us all within the bounds of ordinance, and saves the children of fortune from the envious uprisings of the poor. – William James, The Principles of Psychology