The Quotes canon

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Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind. — Leonardo da Vinci · 1519
I find the great thing in this world is not so much where we stand, as in what direction we are moving. To reach the port of heaven, we must sail sometimes with the wind and sometimes against it,—but we must sail, and not drift, nor lie at anchor. — Oliver Wendell Holmes · 1858