Pierre Fermat

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To divide a cube into two other cubes, a fourth power or in general any power whatever into two powers of the same denomination above the second is impossible, and I have assuredly found an admirable proof of this, but the margin is too narrow to contain it.
Written the margin of his copy of Diophantus's Arithmetica
And perhaps, posterity will thank me for having shown it that the ancients did not know everything.
Quoted in D M Burton, Elementary Number Theory (Boston 1976).
Whenever two unknown magnitudes appear in a final equation, we have a locus, the extremity of one of the unknown magnitudes describing a straight line or a curve.
Introduction to Plane and Solid Loci
I have found a very great number of exceedingly beautiful theorems.