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
Even if one tree falls down it wouldn't affect the entire forest. Chen Shui-bian
Autumn is a second spring when every leaf is a flower. Albert Camus

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