And since arguments of this kind can have no credibility for those who understand my proofs, and, besides, the judgements of many people are so perverse and feeble that they are convinced more readily by the opinions they first encounter, however false and repugnant to reason these are, than by a true and unshakeable refutation of these opinions that they encounter subsequently, I have no intention of responding to them here, since I should first have to set them out.