"... proof is ritual, and a celebration of the power of pure reason. Such an exercise in reassurance may be very necessary in view of all the messes that clear thinking clearly gets us into." - Philip Davis and Reuben Hersh, The Mathematical Experience, p. 151, Birkhauser Boston edition, 1980
"...logic is only the art of going wrong with confidence." - Joseph Wood Krutch (1893-1970), The modern temper; a study and a confession - New York: Harcourt, Brace (1929, repub. 1956). (The university library here - Cornell's - has this book, which I haven't yet read, so I may be able to insert the page number soon; I used en.wikiquote.org for the source.)
