Matthey, a Geneva physician very close to Rousseau's influence, formulates the prospect for all men of reason: 'Do not glory in your state, if you are wise and civilized men; an instant suffices to disturb and annihilate that supposed wisdom of which you are so proud; an unexpected event, a sharp and sudden emotion of the soul will abruptly change the most reasonable and intelligent man into a raving idiot.

Madness and Civilization: A History of Insanity in the Age of Reason (ed. Vintage, 2013) - ISBN: 9780307833105