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.
Technology made large populations possible; large populations now make technology indispensable.
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.
Security depends not so much upon how much you have, as upon how much you can do without.
The wilderness and the idea of wilderness is one of the permanent homes of the human spirit.
Whenever man forgets that man is an animal, the result is always to make him less humane.
Both the cockroach and the bird would get along very well without us, although the cockroach would miss us most.
Cats seem to go on the principle that it never does any harm to ask for what you want.
If people destroy something replaceable made by mankind, they are called vandals; if they destroy something irreplaceable made by God, they are called developers.
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.
Anxiety and distress, interrupted occasionally by pleasure, is the normal course of man's existence.
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.
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.
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.
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.
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.
The most serious charge which can be brought against New England is not Puritanism but February.
A book ... unlike a television program, moving picture or any other 'modern means of communication' ... can wait for years, yet be available at any moment when it happens to be needed.
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.
Logic is the art of going wrong with confidence.
Those whose conscience demands that they defy authority in some ways that involve great consequences must be willing to accept some penalty.
As machines get to be more and more like men, men will come to be more like machines.
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