"You grow old when you lose interest in life, when you cease to dream, to hunger after new truths, and to search for new worlds to conquer. When your mind is open to new ideas, new interests, and when you raise the curtain and let in the sunshine and inspiration of new truths of life and the universe, you will be young and vital."

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We realize the indivisibility of the earth - its soil, mountains, rivers, forests, climate, plants, and animals - and respect it collectively not only as a useful servant but as a living being, vastly less alive than ourselves in degree, but vastly greater than ourselves in time and space - a being that was old when the morning stars sang together, and when the last of us has been gathered unto his fathers, will still be young.

— Aldo Leopold