Charles Sanders Peirce Quotes about Mathematics
Mathematics is purely hypothetical: it produces nothing but conditional propositions.
Charles Sanders Peirce (1931). “Collected Papers of Charles Sanders Peirce”
... and it is probably that there is some secret here which remains to be discovered.
Charles Sanders Peirce, Nathan Houser, Christian J.W. J. W. Kloesel (1992). “The Essential Peirce, Volume 1: Selected Philosophical Writings? (1867–1893)”, p.182, Indiana University Press
Writings of Charles. Sanders Peirce Volume 3 (p. 279)