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

Science and Peace will triumph over Ignorance and War...

The controls of life are structured as forms and nuclear arrangements, in a relation with the motions of the universe.

These microscopic organisms form an entire world composed of species, families and varieties whose history, which has barely begun to be written, is already fertile in prospects and findings of the highest importance. The names of these organisms are very numerous and will have to be defined and in part discarded. The word microbe which has the advantage of being shorter and carrying a more general meaning, and of having been approved by my illustrious friend, M. Littré, the most competent linguist in France, is one we will adopt.

Science advances through tentative answers to a series of more and more subtle questions which reach deeper and deeper into the essence of natural phenomena.

When I approach a child, he inspires in me two sentiments; tenderness for what he is, and respect for what he may become.

Never will the doctrine of spontaneous generation recover from the mortal blow struck by this simple experiment.