Happiness is itself a kind of gratitude.
It is not ignorance but knowledge which is the mother of wonder.
If we do not permit the earth to produce beauty and joy, it will in the end not produce food, either.
Cats seem to go on the principle that it never does any harm to ask for what you want.
We need some contact with the things we sprang from. We need nature at least as a part of the context of our lives. Without cities we cannot be civilized. Without nature, without wilderness even, we are compelled to renounce an important part of our heritage.
Technology made large populations possible; large populations now make technology indispensable.
If people destroy something replaceable made by mankind, they are called vandals; if they destroy something irreplaceable made by God, they are called developers.
It is sometimes easier to head an institute for the study of child guidance than it is to turn one brat into a decent human being.
The wilderness and the idea of wilderness is one of the permanent homes of the human spirit.
The snow itself is lonely or, if you prefer, self-sufficient. There is no other time when the whole world seems composed of one thing and one thing only.
Metaphysics may be, after all, only the art of being sure of something that is not so and logic only the art of going wrong with confidence.
When a man wantonly destroys one of the works of man we call him a vandal. When he destroys one of the works of god we call him a sportsman.
To those who study her, Nature reveals herself as extraordinarily fertile and ingenious in devising means, but she has no ends which the human mind has been able to discover or comprehend.
Whenever man forgets that man is an animal, the result is always to make him less humane.
The mind leaps, and leaps perhaps with a sort of elation, through the immensities of space, but the spirit, frightened and cold, longs to have once more above its head the inverted bowl beyond which may lie whatever paradise its desires may create.
Nature takes no account of even the most reasonable of human excuses.
We must not judge the society of the future by considering whether or not we should like to live in it; the question is whether those who have grown up in it will be happier than those who have grown up in our society or those of the past.
To have passed through life and never experienced solitude is to have never known oneself. To have never known oneself is to have never known anyone.
Nothing is too great or too good to be true. Do not believe that we can imagine things better than they are. In the long run, in the ultimate outlook, in the eye of the Creator, the possibilities of existence, the possibilities open to us, are beyond our imagination.
Anxiety and distress, interrupted occasionally by pleasure, is the normal course of man's existence.
Logic is the art of going wrong with confidence.
Cats are rather delicate creatures and they are subject to a good many different ailments, but I have never heard of one who suffered from insomnia.
Both the cockroach and the bird would get along very well without us, although the cockroach would miss us most.
The famous balance of nature is the most extraordinary of all cybernetic systems. Left to itself, it is always self-regulated.
Being the inventor of sex would seem to be a sufficient distinction for a creature just barely large enough to be seen by the naked eye.
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