The chief cause of human errors is to be found in the prejudices picked up in childhood.

There is nothing more ancient than the truth.

Even those who have the weakest souls could acquire absolute mastery over all their passions if we employed sufficient ingenuity in training and guiding them.

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.

Human wisdom remains always one and the same although applied to the most diverse objects and it is no more changed by their diversity than the sunshine is changed by the variety of objects which it illuminates.

De omnibus dubitandum

There is nothing so far removed from us as to be beyond our reach, or so hidden that we cannot discover it.