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The reductio ad absurdum is God's favorite argument.

— George Tyrrell

“ Euclid 's Elements has been for nearly twenty-two centuries the encouragement and guide of that scientific thought which is one thing with the…

— William Kingdon Clifford

We think of Euclid as of fine ice; we admire Newton as we admire the peak of Teneriffe. Even the intensest labors, the most…

— Walter Bagehot

“It (proof by contradiction) is a far finer gambit than any chess gambit: a chess player may offer the sacrifice of a pawn or…

— G.H. Hardy

“Such is the arithmetic of adventure, in which two and two no more make only four than that Euclid rules in the Universe of…

— William Bolitho

It is shocking that young people should be addling their brains over mere logical subtleties in Euclid's Elements, trying to understand the proof of…

— Oliver Heaviside

Let me tell you how at one time the famous mathematician Euclid became a physician. It was during a vacation, which I spent in…

— Bernard Bolzano

The science of the church is neglected for the study of geometry, and they lose sight of Heaven while they are employed in measuring…

— Edward Gibbon

“That this blind and aging man forged ahead with such gusto is a remarkable lesson, a tale for the ages. Euler's courage, determination, and…

— William Dunham

Euclid 's manner of exposition, progressing relentlessly from the data to the unknown and from the hypothesis to the conclusion, is perfect for checking…

— George Polya

“His idea was to begin with those broad truths that must underlie all conceivable mental existences and establish a basis on those. The great…

— H.G. Wells

The early study of Euclid made me a hater of geometry.

— James Joseph Sylvester