Why doesn't the fellow who says, I'm no speechmaker let it go at that instead of giving a demonstration?
— Kin Hubbard

Man has demonstrated that he is master of everything -- except his own nature.
Henry Miller demonstrate quote

Demonstrate quotes
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I demonstrate by means of philosophy that the earth is round, and is inhabited on all sides; that it is insignificantly small, and is borne through the stars.
— Johannes Kepler

We must not demonstrate any arrogance, and we must refrain from any irrational or undemocratic behavior.
— Chen Shui-bian

It is as impossible for man to demonstrate the existence of God as it would be for even Sherlock Holmes to demonstrate the existence of Arthur Conan Doyle.
— demonstrate quotation by Frederick Buechner