These days there are books written on how to reduce the noise in the cities and even associations formed to assist with this reduction of noise. However, it is not about reducing the noise but about developing the inner strength through meditation and equanimity of soul to shut it out. It is not the excessive noise in the cities that is harmful but the demons that move through them; these demons are actually kept in check somewhat by the racket. One needs to learn to live with the noise without becoming annoyed by it.
Source (German): Rudolf Steiner – GA 266a – Aus den Inhalten der esoterischen Stunden – Munich, November 8, 1908 (page 429)
Translated by Nesta Carsten-Krüger