The theory of the analytic-synthetic dichotomy presents men with the following
choice: If your statement is proved, it says nothing about that which exists;
if it is about existents, it cannot be proved. If it is demonstrated by
logical argument, it represents a subjective convention; if it asserts a fact,
logic cannot establish it. If you validate it by an appeal to the meanings of
your concepts, then it is cut off from reality; if you validate it by an
appeal to your percepts, then you cannot be certain of it.