These Americans are vigorous, prolific, yet when I just quoted Descartes on Chinese for discussion, nothing offensive, they deleted. Here are other quotes:
Divide each difficulty into as many parts as is feasible and necessary to resolve it.
Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.
If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.