“Dogma gives a charter to mistake, but the very breath of science is a contest with mistake, and must keep the conscience alive.”
“Don't mistake dramatics for a conscience.”
“I've got to keep breathing. It'll be my worst business mistake if I don't.”
“Reason often makes mistakes, but conscience never does.”
“In science, mistakes always precede the truth.”
“Science, my lad, is made up of mistakes, but they are mistakes which it is useful to make, because they lead little by little to the truth.”