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I find no quality so easy for a man to counterfeit as devotion, though his life and manner are not conformable to it; the essence of it is abstruse and occult, but the appearances easy and showy.

Michel de Montaigne (1849). “Works: Comprising His Essays, Letters, and Journey Through Germany and Italy; with Notes, Notices, Etc”, p.401
I find no quality so easy for a man to counterfeit as devotion, though his life and manner are not conformable to it; the essence of it is abstruse and occult, but the appearances easy and showy.