“No one species shall make the life of the world its own.' … That's one expression of the law. Here's another: 'The world was not made for any one species.”

“One species on the planet, and one species only, has reached the point of being able to have an impact on the evolutionary fortunes of all other species and upon the functioning of all ecosystems. We also have, in a way that is not true for any other species, a relationship to the planet as a whole and to the future. We live with all life.”

“The law of evolution is that the strongest survives!' 'Yes, and the strongest, in the existence of any social species, are those who are most social. In human terms, most ethical...There is no strength to be gained from hurting one another. Only weakness.”

“The world must live. We are only one species among billions. The gods don't love us any more than they love spiders or bears or whales or water lilies.”

“What is revolution except a systematic way for one species to eat another alive?”

“The full meaning of a language is never translatable into another. We may speak several languages but one of them always remains the one in which we live. In order completely to assimilate a language it would be necessary to make the world which it expresses one's own and one never does belong to two worlds at once.”