If you suppress laboratories, physical science will be stricken with barrenness and death.

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

Herrmann Pidoux and Armand Trousseau stated 'Disease exists within us, because of us, and through us', Pasteur did not entirely disagree, 'This is true for certain diseases', he wrote cautiously, only to add immediately: 'I do not think that it is true for all of them'.

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

If it is a terrifying thought that life is at the mercy of the multiplication of these minute bodies [microbes], it is a consoling hope that Science will not always remain powerless before such enemies.

In the fields of observation chance favors only those minds which are prepared.

Blessed is he who carries within himself a God, an ideal, and who obeys it: ideal of art, ideal of science, ideal of the gospel virtues, therein lie the springs of great thoughts and great actions; they all reflect light from the Infinite.