Every attempt to employ mathematical methods in the study of chemical questions must be considered profoundly irrational and contrary to the spirit of chemistry.... if mathematical analysis should ever hold a prominent place in chemistry -- an aberration which is happily almost impossible -- it would occasion a rapid and widespread degeneration of that science.

C'este donc par l'étude des mathématiques, et seulement par elle, que l'on peut se faire une idée juste et approfondie de ce que c'est qu'une science.

If we do not allow free thinking in chemistry or biology, why should we allow it in morals or politics?

To reorganize society without God or King, by the systematic culture of Humanity.

The heavens declare the glory of Kepler and Newton.

Positivism is a theory of knowledge according to which the only kind of sound knowledge available to human kind is that if science grounded in observation.

The word right should be excluded from political language, as the word cause from the language of philosophy.