If you want to change attitudes, start with a change in behavior.

The line expresses a pragmatic, action-first view of personal and social change: rather than waiting for feelings, beliefs, or “attitudes” to shift on their own, one can begin by altering outward conduct—habits, routines, and choices—so that new attitudes follow. It aligns with the idea that behavior can shape emotion and belief through practice, repetition, and social feedback (a notion often associated with modern behavioral psychology). Attributed to Katharine Hepburn, it also fits her public persona of discipline and self-direction: change is something you do, not merely something you think about. The quote’s appeal lies in its counsel for leadership and self-improvement—model the behavior you want, and the mindset may catch up.