[58] [cap.9] What has now then been said with the view of establishing the truth in the matter inquired into is, in my opinion, sufficient. But since physicians are accustomed to cure various diseases with still more various remedies, it is necessary that we should bring a series of proofs, keeping close to the subject, in order to establish those propositions which appear paradoxical by reason of their unusual character. For some people, even if they are convicted by ever so close a series of proofs, can hardly be brought to see their error.