Erckmann-Chatrian said this quote

“ I reeled with giddiness - flames passed before my eyes.I remembered those precipices that drew one towards them with irresistible power - wells that have had to be filled up because of persons throwing themselves into them - trees that have had to be cut down because of people hanging themselves upon them - the contagion of suicide and theft and murder, which at various times has taken possession of people's minds, by means well understood; that strange inducement, which makes people kill themselves because others kill themselves. My hair rose upon my head with horror!(The Invisible Eye) ”