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We actually perceive by the aid of the senses nothing except the effects or sensible qualities and corporeal things entirely passive, whether in motion or at rest; and reason and experience advise us that there is nothing active except mind or soul. Whatever else is imagined must be considered to be of a kind with other hypotheses and mathematical abstrac- tions. This ought to be laid to heart; otherwise we are in danger of sliding back into the obscure subtlety of the School- men, which for so many ages like some dread plague, has corrupted philosophy.
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