Paul Sabatier

Theories cannot claim to be indestructible. They are only the plough which the ploughman uses to draw his furrow and which he has every right to discard for another one, of improved design, after the harvest. To be this ploughman, to see my labours result in the furtherance of scientific progress, was the height of my ambition, and now the Swedish Academy of Sciences has come, at this harvest, to add the most brilliant of crowns.

Friendship among men, when it overpasses a certain limit, has something deep, high, ideal, infinitely sweet, to which no other friendship attains.

For men to love each other truly, they must have shed tears together.