Without theory, practice is but routine born of habit. Theory alone can bring forth and develop the spirit of invention. ... [Do not] share the opinion of those narrow minds who disdain everything in science which has not an immediate application. ... A theoretical discovery has but the merit of its existence: it awakens hope, and that is all. But let it be cultivated, let it grow, and you will see what it will become.

The greatest derangement of the mind is to believe in something because one wishes it to be so.

La fortuna juega a favor de una mente preparada

Life comes only from life.

Will opens the door to success, both brilliant and happy.

Since the most ancient times, all men, and particularly those who endeavored in the practice of medicine, have brought closer together two natural phenomena of capital importance: illness or fever and fermentation.

It would seem to me that I was committing a theft if I were to let one day go by without doing some work.