logic
“I never make exceptions. An exception disproves the rule.”
“Data! Data! Data! I can't make bricks without clay.”
“What one man can invent another can discover.”
“You know that all my physics is nothing else than geometry.”
“Stupidity is a talent for misconception.”
“We are committed to those entities to which the bound variables of our best theories must be capable of referring.”
“No entity without identity.”
“To be is to be the value of a bound variable.”
“I never guess. It is a shocking habit—destructive to the logical faculty.”
“When you have eliminated the impossible, whatever remains, however improbable, must be the truth.”
“Divide each difficulty into as many parts as is feasible and necessary to resolve it.”