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All the truths of mathematics are linked to each other, and all means of discovering them are equally admissible. – Adrien-Marie Legendre
The powers of nature are never in repose; her work never stands still. – Adam Sedgwick
Lose your schematic conventions by finding some surprising symbol or shape in the welter of shades, and draw that. – Adam Gopnik
Science, in the very act of solving problems, creates more of them. – Abraham Flexner