If reason did the work, it would have to be relying on the principle that

Instances of which we haven’t had experience must resemble those of which we have; the course of Nature continues always uniformly the same.

In order to clear this matter up, therefore, let us consider all the arguments that might be given to support such a proposition. They will have to be based either on •·absolutely certain· knowledge or on •probability; so let us look into each of these degrees of certainty, to see whether either provides us with a sound conclusion along these lines.

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