Those who taught me the infinitesimal calculus … tried to persuade me to accept the official sophistries as an act of faith.

Those who taught me the infinitesimal calculus did not know the valid proofs of its fundamental theorems and tried to persuade me to accept the official sophistries as an act of faith.

— Bertrand Russell (Welsh philosopher, logician, mathematician, historian, and social critic, 1872 –1970)