For in the final analysis, had it been necessary for him to examine the configurations of the parts of some fruit, then those of the parts of his body, and then the resultant relation between them, in order to judge whether, with the present temperature of his blood and the thousand other dispositions of his body, the fruit was nourishing, then clearly things unworthy of its attention would have exhausted his mind's capacity; to do so would have even been useless enough, because he would not have preserved himself for long by this means alone.