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.

You have not succeeded in your experiments, that is all there is to it.

I give them experiments and they respond with speeches.

One does not ask of one who suffers: What is your country and what is your religion? One merely says: You suffer, that is enough for me.

These are the living springs of great thoughts and great actions. Everything grows clear in the reflections from the Infinite.

Imagination should give wings to our thoughts but we always need decisive experimental proof, and when the moment comes to draw conclusions and to interpret the gathered observations, imagination must be checked and documented by the factual results of the experiment.

How do you know that the incessant progress of science will not compel scientists to consider that life has existed during eternity, and not matter?