Faithfulness is indispensable to society’s persistence over time.

Evidence

Without the phenomenon we call faithfulness, society could simply not exist, as it does, for any length of time. The elements which keep it alive the self-interest of its members, suggestion, coercion, idealism, mechanical habit, sense of duty, love, inertia could not save it from breaking apart if they were not supplemented by this factor. — Georg Simmel, The Sociology of Georg Simmel, 9077