Posterity will one day laugh at the foolishness of modern materialistic philosophers.

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.

If science has no country, the scientist should have one, and ascribe to it the influence which his works may have in this world.

Wine is the healthiest and most health-giving of drinks.

The nights seem to me too long... I am often scolded by Madame Pasteur, but I tell her I shall lead her to fame.

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

Worship the spirit of criticism. If reduced to itself it is not an awakener of ideas or a stimulant to great things, but, without it, everything is fallible; it always has the last word.