Mathematicians Are Born, Not Made.

Experiment Is The Sole Source Of Truth.

Just As Houses Are Made Of Stones, So Is Science Made Of Facts.

Later Generations Will Regard Mengenlehre (set Theory) As A Disease From Which One Has Recovered.

All Great Progress Takes Place When Two Sciences Come Together, And When Their Resemblance Proclaims Itself, Despite The Apparent Disparity Of Their Substance.

Absolute Space, That Is To Say, The Mark To Which It Would Be Necessary To Refer The Earth To Know Whether It Really Moves, Has No Objective Existence.... The Two Propositions: "the Earth Turns Round" And "it Is More Convenient To Suppose The Earth Turns Round" Have The Same Meaning; There Is Nothing More In The One Than In The Other.