It is surmounting difficulties that makes heroes.

Every chemical substance, whether natural or artificial, falls into one of two major categories, according to the spatial characteristic of its form. The distinction is between those substances that have a plane of symmetry and those that do not. The former belong to the mineral, the latter to the living world.

The more I know, the more nearly is my faith that of the Breton peasant. Could I but know all I would have the faith of a Breton peasant woman.

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

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

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

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