Are the atoms of the dextroacid (tartaric) grouped in the spirals of a right-hand helix or situated at the angles of an irregular tetrahedron, or arranged in such or such particular unsymmetrical fashion? We are unable to reply to these questions. But there can be no reason for doubting that the grouping of the atoms has an unsymmetrical arrangement with a non-superimposable image. It is not less certain that the atoms of the laevo-acid realize precisely an unsymmetrical arrangement of the inverse of the above.

To know how to wonder and question is the first step of the mind toward discovery.

One does not ask of one who suffers: What is your country and what is your religion? One merely says: You suffer, that is enough for me.

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

Chance favors the prepared mind.

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

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