Michel de Montaigne,
The Essays of Montaigne — Chapter XXII. Of custom…
(1877)
“ For, in truth, custom is a violent and treacherous schoolmistress. She, by little and little, slily and unperceived, slips in the foot of her authority, but having by this gentle and humble beginning, with the benefit of time, fixed and established it, she then unmasks a furious and tyrannic countenance, against which we have no more the courage or the power so much as to lift up our eyes. We see her, at every turn, forcing and violating the rules of nature: "Usus efficacissimus rerum omnium magister." ”
