Abstract
Hume's analyses of human apprehension and of causality were the most penetrating up to his time and continue to have great influence. Contemporary Spanish philosopher Xavier Zubiri has examined both and identified three underlying errors: the failure to recognize that there are three stages of human intellection, and especially that the first, primordial apprehension, has quite unique characteristics; the attempt to place an excessive burden on the content of impressions while ignoring what Zubiri terms their 'formality of reality'; and the failure to recognize that functionality, not causality, is the basis for most of our knowledge. Causal chains in general cannot be adequately known, and therefore are not and cannot be the basis of our knowledge of the external world. Only in the area of persons and morality does causality play a critical role.