If we really want to define spirit, the best definition is pure intelligence. Because, occupied as we are with this world of illusion, we retain in our mind impressions and knowledge of the material world, we are not always able to experience that part of our being which is pure intelligence. We generally use the word intelligence in quite a different sense; when we say that someone is intelligent we mean that he is clever. But pure intelligence has nothing to do with cleverness; nor can one call pure intelligence the knowing quality, for it is above this.