“In science there are no 'depths'; there is surface everywhere.”

“There are no beautiful surfaces without a terrible depth.”

“There are no beautiful surfaces without a terrible depth.”

“I don't mind hidden depths but I insist that there be a surface.”

“The need of a constantly expanding market for its products chases the bourgeoisie over the whole surface of the globe. It must nestle everywhere, settle everywhere, establish connections everywhere.”

“.. the flat surface of a perfectly calm ocean [which] disturbs us.... by all the unknown that is hidden in the depth.”

“The men of God are like fishes in the ocean; they pop up into view on the surface here and there and everywhere, as they please.”

“We make choices, decisions, as long as we keep to the surface of things; once we reach the depths, we can neither choose nor decide, we can do nothing but regret the surface…”

“There is a single light of science, and to brighten it anywhere is to brighten it everywhere.”

“But these young people have such an intelligent, knowledgeable surface, and then the crust suddenly breaks and you look down into the depths of confusion you didn't know existed.”