Some have a species of instinct (the source of which they are ignorant of), and decide all questions that come before them by its aid, and always decide rightly. These follow their taste more than their intelligence, because they do not permit their temper and self-love to prevail over their natural discernment. All they do is in harmony, all is in the same spirit. This harmony makes them decide correctly on matters, and form a correct estimate of their value.

Reflections on Various Subjects (1665–1678)