As a good psychologist should, he gives an explanation of the prejudice that we can argue a priori about cause and effect: We fancy, that were we brought, on a sudden into this world, we could at first have inferred, that one Billiard-ball would communicate motion to another upon impulse; and that we needed not to have waited for the event, in order to pronounce with certainty concerning it. Such is the influence of custom, that, where it is strongest, it not only covers our natural ignorance, but even conceals itself, and seems not to take place, merely because it is found in the highest
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