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.

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

Where observation is concerned, chance favors only the prepared mind.

Live in the serene peace of laboratories and libraries

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.

Time is the best appraiser of scientific work, and I am aware that an industrial discovery rarely produces all its fruit in the hands of its first inventor.

In good philosophy, the word cause ought to be reserved to the single Divine impulse that has formed the universe.