"It is a pretty structure isn’t it? It makes you think of something solid, stable, well-linked. In fact it happens also in chemistry as in architecture that “beautiful” edifices, that is, symmetrical and simple, are also the most sturdy: in short, the same thing happens with molecules as with the cupolas of cathedrals of the arches of bridges."

“We who survived the Camps are not true witnesses. We are those who, through prevarication, skill or luck, never touched bottom. Those who have, and who have seen the face of the Gorgon, did not return, or returned wordless.”

“A country is considered the more civilised the more the wisdom and efficiency of its laws hinder a weak man from becoming too weak and a powerful one too powerful.”

“Beware of analogies: for millenia they corrupted medicine, and it may be their fault that today's pedagogical systems are so numerous, and after three thousand years of argument we still don't know which is best.”

“I read somewhere — and the person who wrote this was not a mountaineer but a sailor — that the sea’s only gifts are harsh blows and, occasionally, the chance to feel strong. Now, I don’t know much about the sea, but I do know that that’s the way it is here. And I also know how important it is in life not necessarily to be strong but to feel strong, to measure yourself at least once, to find yourself at least once in the most ancient of human conditions, facing blind, deaf stone alone, with nothing to help you but your own hands and your own head.”

“To be considered stupid and to be told so is more painful than being called gluttonous, mendacious, violent, lascivious, lazy, cowardly: every weakness, every vice, has found its defenders, its rhetoric, its ennoblement and exaltation, but stupidity hasn’t.”

“The trade of chemist , teaches you to overcome, indeed to ignore, certain revulsions that are neither necessary or congenital: matter is matter, neither noble nor vile, infinitely transformable, and its proximate origin is of no importance whatsoever. Nitrogen is nitrogen, it passes miraculously from the air into plants, from these into animals, and from animals into us; when its function in our body is exhausted, we eliminate it, but it still remains nitrogen, aseptic, innocent.”