The greatest minds are capable of the greatest vices as well as of the greatest virtues.
Author: Rene Descartes
It is not enough to have a good mind; the main thing is to use it well.
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.
Divide each difficulty into as many parts as is feasible and necessary to resolve it.