Silence purifies. Those who are dedicated to silence must persevere in our over-busy world zones of purified air. We must struggle against the asphyxiation, which threatens the cities of our consumer society. We live in a world mentally polluted by verbal intoxication. If dedication to silence did not exist, it would be necessary to invent it.
It so happens that the work which is likely to be our most durable monument, and to convey some knowledge of us to the most remote posterity, is a work of bare utility; not a shrine, not a fortress, not a palace, but a bridge.