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The woods are lovely, dark and deep. But I have promises to keep, and miles to go before I sleep.Robert Frost
Nature holds the key to our aesthetic, intellectual, cognitive and even spiritual satisfaction.E. O. Wilson
There are three principal means of acquiring knowledge... observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.Denis Diderot
As a single footstep will not make a path on the earth, so a single thought will not make a pathway in the mind. To make a deep physical path, we walk again and again. To make a deep mental path, we must think over and over the kind of thoughts we wish to dominate our lives.Henry David Thoreau
Even if one tree falls down it wouldn't affect the entire forest.Chen Shui-bian