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“Geometry has two great treasures; one is the Theorem of Pythagoras; the other, the division of a line into extreme and mean ratio. The first we may compare to a measure of gold; the second we may name a precious jewel.”
― Johannes Kepler

“In fact, so detailed was his interest in mathematics, and so acute his understanding, that he had recently written an original proof of the Pythagorean Theorem during a free moment at the capital. The New England Journal of Education had published the proof just the month before, transparently astonished that a member of congress had written it. Despite Garfield's deep admiration for mathematics and the arts, however, he believed that it was science, above all other disciplines that had achieved the greatest good.”
― Candice Millard, Destiny of the Republic: A Tale of Madness, Medicine and the Murder of a President

“Even before the sun shone on us, even before there was air to breathe, the square of the hypotenuse was equal to the sum of the squares on the other two sides.”
― Malba Tahan, The Man Who Counted: A Collection of Mathematical Adventures