Reason and justice tell me there's more love for humanity in electricity and steam than in chastity and vegetarianism.

I often wonder: suppose we could begin life over again, knowing what we were doing? Suppose we could use one life, already ended, as a sort of rough draft for another? I think that every one of us would try, more than anything else, not to repeat himself, at the very least he would rearrange his manner of life, he would make sure of rooms like these, with flowers and light ... I have a wife and two daughters, my wife's health is delicate and so on and so on, and if I had to begin life all over again I would not marry. ... No, no!

There should be more sincerity and heart in human relations, more silence and simplicity in our interactions. Be rude when you're angry, laugh when something is funny, and answer when you're asked.

I have the feeling that I've seen everything, but failed to notice the elephants.

Oh, I don't object, of course, to cutting wood from necessity, but why destroy the forests? The woods of Russia are trembling under the blows of the axe. Millions of trees have perished. The homes of the wild animals and birds have been desolated; the rivers are shrinking, and many beautiful landscapes are gone forever. And why? Because men are too lazy and stupid to stoop down and pick up their fuel from the ground.

Man has been endowed with reason, with the power to create, so that he can add to what he's been given. But up to now he hasn't been a creator, only a destroyer. Forests keep disappearing, rivers dry up, wild life's become extinct, the climate's ruined and the land grows poorer and uglier every day.

Perhaps man has a hundred senses, and when he dies the five senses that we know perish with him, and the other ninety-five remain alive... Everything that is unattainable for us now will one day be near and clear... But we must work.