Every child should have mud ...

Every child should have mud pies, grasshoppers, water bugs, tadpoles, frogs, mud turtles, elderberries, wild strawberries, acorns, chestnuts, trees to climb. Brooks to wade, water lilies, woodchucks, bats, bees, butterflies, various animals to pet, hayfields, pine-cones, rocks to roll, sand, snakes, huckleberries and hornets; and any child who has been deprived of these has been deprived of the best part of education.
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 Luther Burbank

Quotes from the same author

All scientists have found that preconceived notions, dogmas, and all personal prejudice and bias, must be set aside, listening patiently, quietly and reverently to the lessons, one by one, which Mother Nature has to teach, shedding light on that which was before a mystery, so that all who will may see and know. She conveys her truths only to those who are passive and receptive.
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 Luther Burbank
Religion grows with the intelligence of man, but all religions of the past and probably all of the future will sooner or later become petrified forms instead of living helps to mankind. Until that time comes, however, if religion of any name or nature makes man more happy, comfortable, and able to live peaceably with his brothers, it is good.
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 Luther Burbank
Do not feed children on a maudlin sentimentalism or dogmatic religion; give them nature. Let their souls drink in all that is pure and sweet. Rear them, if possible, amid pleasant surroundings ... Let nature teach them the lessons of good and proper living, combined with an abundance of well-balanced nourishment. Those children will grow to be the best men and women. Put the best in them by contact with the best outside. They will absorb it as a plant absorbs the sunshine and the dew.
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 Luther Burbank
Although I went to college as a youth, I never considered it necessary to steep oneself in academic learning, in order to learn how to think. I welcome a fair and square, open and above-board fight on any subject, including this, but I despise a man who sneaks around under a cloak or cover of any society or clique to strike his blows.
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 Luther Burbank
Bryan - a great friend of mine, by the way - had a Neanderthal type of head, Burbank says. As to Riley, he has not even the oratorical skill of Bryan. The whole movement is based on the poor whites of the south.
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 Luther Burbank