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The simplest schoolboy is now familiar with truths for which Archimedes would have sacrificed his life.

In the depth of winter I finally learned that there was in me an invincible summer

One must ask children and birds how cherries and strawberries taste

The man who will use his skill and constructive imagination to see how much he can give for a dollar, instead of how little he can give for a dollar, is bound to succeed.

Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught

The only source of knowledge is experience