Atheism being a proposition as unnatural as monstrous, difficult also and hard to establish in the human understanding, how arrogant soever, there are men enough seen, out of vanity and pride, to be the authors of extraordinary and reforming opinions, and outwardly to affect the profession of them; who, if they are such fools, have, nevertheless, not the power to plant them in their own conscience.

The Essays of Montaigne - Complete