Tides of opinion

Once a tide in opinion or in affairs is strongly set, it tends to overwhelm counter-currents and to keep going for a long time in the same direction. The tides are capable of ignoring geography, political labels, and other hindrances to their continuance. Yet it is also worth recalling that their very success tends to create conditions that may ultimately reverse them.

Milton and Rose Friedman: The Tide in the Affairs of Men