"The ease with which you have assimilated my notions of geometry has been a source of genuine delight to me, especially as so few possess a natural bent for them. I am profoundly convinced that the theory of space occupies an entirely different position with regard to our knowledge a priori from that of the theory of numbers (Grössenlehre); that perfect conviction of the necessity and therefore the absolute truth which is characteristic of the latter is totally wanting to our knowledge of the former. We must confess in all humility that a number is solely a product of our mind. Space, on the other hand, possesses also a reality outside of our mind, the laws of which we cannot fully prescribe a priori."
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Carl Friedrich Gauss, Letter to Friedrich Bessel (Jan 27, 1829) as quoted by Paul Carus, The Foundations of Mathematics: A Contribution to the Philosophy of Geometry (1908) p.13
https://en.wikiquote.org/wiki/Foundations_of_mathematics
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Foundations of mathematics
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