"What are we to think of those compilers who have indiscreetly broken open the door of the sciences, and introduced into their sanctuary a populace unworthy to approach it, when it was greatly to be wished that all who should be found incapable of making a considerable progress in the career of learning should have been repulsed at the entrance, and thereby cast upon those arts which are useful to society. A man who will be all his life a bad versifier, or a third-rate geometrician, might have made nevertheless an excellent clothier. Those whom nature intended for her disciples have not needed masters. Bacon, Descartes and Newton, those teachers of mankind, had themselves no teachers. What guide indeed could have taken them so far as their sublime genius directed them? Ordinary masters would only have cramped their intelligence, by confining it within the narrow limits of their own capacity. It was from the obstacles they met with at first, that they learned to exert themselves, and bestirred themselves to traverse the vast field which they covered. If it be proper to allow some men to apply themselves to the study of the arts and sciences, it is only those who feel themselves able to walk alone in their footsteps and to outstrip them. It belongs only to these few to raise monuments to the glory of the human understanding. But if we are desirous that nothing should be above their genius, nothing should be beyond their hopes. This is the only encouragement they require."