If the fact were really, as Hume supposed, that we have _no_ reason for our inferences from experience, and draw them only because either we have been in the habit of drawing them, or because we are so constituted as to be unable to help drawing them, the reason of our drawing them plainly could not be that we perceive any necessary connection between antecedent and consequent events, or any force or power binding these together as cause and effect. Accordingly, Hume does not scruple to affirm that 'we have no idea of connection or power at all, and that these words are absolutely without meaning when employed either in philosophical reasoning or in common life.' Every idea, he argues, referring to a rule which he somewhat hastily supposes himself to have already proved to be without exception, must needs have been copied from some preceding sensible impression, but neither from within nor from without can we have received an impression from which this particular idea can have been copied. No keenest scrutiny of any portion of matter, no study of its external configuration or internal structure could, previously to experience, enable us to conjecture that it could produce any effect whatever, still less any particular effect: could enable us to guess, for instance, that flame would burn, or ice would chill, if touched. Nor even though on once touching flame we get our fingers burnt, are mature philosophers like us to conclude, as if we had no more intelligence than so many babies, that if we touch again we shall be burnt again. All we have as yet learnt from the experiment is that the sensation of touching fire has once been followed by the sensation of burning, but nothing has occurred to suggest that in the first sensation lurked any secret power of producing the second. And what a single experiment does not prove, no number of repetitions of precisely the same experiment with precisely the same results can prove. Even though on a lengthened course of experience we have found that in every case of our touching flame our fingers have been burnt, we are still as far as ever from perceiving any bond of connection between the two events. We do indeed believe that as flame when touched has hitherto invariably burnt, so, whenever touched hereafter, it will hereafter invariably burn; but this, according to Hume, we believe simply because by long practice we have contracted such a habit of associating the idea of touched flame with burnt fingers, that whenever we witness the one we cannot help expecting the other.