I have a low opinion of ...

I have a low opinion of books; they are but piles of stones set up to show coming travelers where other minds have been, or at best signal smokes to call attention. No amount of word-making will ever make a single soul to know these mountains. As well seek to warm the naked and frostbitten by lectures on caloric and pictures of flame. One day\'s exposure to mountains is better than cartloads of books.
I have a low opinion of books; they are but piles of stones set up to show coming travelers where other minds have been, or at best signal smokes to call attention. No amount of word-making will ever make a single soul to know these mountains. As well seek to warm the naked and frostbitten by lectures on caloric and pictures of flame. One day's exposure to mountains is better than cartloads of books.
 John Muir

Quotes from the same author

When one tugs at a single thing in nature, he finds it attached to the rest of the world.
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 John Muir
In every walk with nature, one receives far more than he seeks.
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 John Muir
There is a love of wild nature in everybody, an ancient mother-love showing itself whether recognized or no, and however covered by cares and duties
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 John Muir
I like to walk, touch living Mother Earth—bare feet best, and thrill every step. Used to envy happy reptiles that had advantage of so much body in contact with earth, bosom to bosom. [We] live with our heels as well as head and most of our pleasure comes in that way.
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 John Muir
Perhaps the profession of doing good may be full, but every body should be kind at least to himself. Take a course of good water and air, and in the eternal youth of Nature you may renew your own. Go quietly, alone; no harm will befall you. Some have strange, morbid fears as soon as they find themselves with Nature, even in the kindest and wildest of her solitudes, like very sick children afraid of their mother-as if God were dead and the devil were king.
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 John Muir