Pascal's Pensées

Montaigne is wrong. Custom should be followed only because it is custom, and not because it is reasonable or just. But people follow it for this sole reason, that they think it just. Otherwise they would follow it no longer, although it were the custom; for they will only submit to reason or justice. Custom without this would pass for tyranny; but the sovereignty of reason and justice is no more tyrannical than that of desire. They are principles natural to man.

It would therefore be right to obey laws and customs, because they are laws; but we should know that there is neither truth nor justice to introduce into them, that we know nothing of these, and so must follow what is accepted. By this means we would never depart from them. But people cannot accept this doctrine; and, as they believe that truth can be found, and that it exists in law and custom, they believe them, and take their antiquity as a proof of their truth, and not simply of their authority apart from truth. Thus they obey laws, but they are liable to revolt when these are proved to be valueless; and this can be shown of all, looked at from a certain aspect.