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

Messieurs, c'est les microbes qui auront le dernier mot." (Gentlemen, it is the microbes who will have the last word.)

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.

Oh my goodness the mystery that has prompted my objective. My quality lies exclusively in my tirelessness.

Bernard was right. The germ is nothing, the terrain is everything.

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

Fortune favors the well-prepared.