“To be a man is, precisely, to be responsible. It is to feel shame at the sight of what seems to be unmerited misery. It is to take pride in a victory won by one's comrades. It is to feel, when setting one's stone, that one is contributing to the building of the world.”

“He is among those beings of great scope who spread their leafy branches willingly over broad horizons. To be a man is, precisely, to be responsible. It is to know shame at the sight of poverty which is not of our making. It is to be proud of a victory won by our comrades. It is to feel, as we place our stone, that we are contributing to the building of the world.”

“How was it that Adrian Ivashkov, who never seemed to take anything seriously was the only one among these "responsible" people who paid attention to such small details? How was he the only one to really understand the magnitude of what I was feeling?”

“To truly esteem oneself means that one must be capable of feeling shame or self-disgust when one does not live up to a certain standard”

“Mine was the unbearable jealousy a cultured pearl must feel toward a genuine one. Or can there be such a thing in this world as a man who is jealous of the woman who loves him, precisely because of her love?”

“No one really starts anything new, Mrs. Nemur. Everyone builds on other men's failures. There is nothing really original in science. What each man contributes to the sum of knowledge is what counts.”