Everywhere we encounter nothing but faulty minds, who have practically no ability to discern the truth. They view everything from the wrong angle; they are satisfied by the worst reasons and want to satisfy others with them. They let themselves be carried away by the slightest appearances; they are always in excess and extremes; they have no grasp for holding firmly to the truth they know because they are attached to them more by chance than solid enlightenment. Or else they insist on nonsense with such obstinacy that they hear nothing that could set them straight. They decide boldly about what they do not know, what they do not understand, and what perhaps no one has ever understood.
Port-Royal Logic, 1662