I know of no quality so easy to counterfeit as piety, if conduct and life are not made to conform with it.  Its essence is abstruse and occult; its semblane, easy and showy. (748)

Any man can play his part in the side show and represent a worthy man on the boards; but to be disciplined within, in his own bosom, where all is permissible, where all is concealed — that’s the point. (743-745)

~Michel De Montaigne, Essays: Of Repentance.