However convincing those arguments may appear, I mustn’t rest content with them, but must turn the subject on every side in order to find new points of view from which I can illustrate and confirm these extraordinary and fundamental principles. Philosophers are right when they conscientiously hesitate to accept a new hypothesis; their attitude is necessary for progress towards the truth, and should be respected. So I must produce every argument that may tend to their satisfaction, and remove every objection that may stop them in their reasoning.

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