Rudolf Steiner, from The Riddles of Philosophy, Part 2, Chapter 8:
"The percept is that part of reality that is given objectively; the concept, the part that is given subjectively, through intuition. Our mental organization tears the reality apart into these two factors. The one factor presents itself to perception, the other to intuition. Only the union of the two, that is, the percept fitting systematically into the universe, constitutes the full reality. If we take mere percepts by themselves we have no reality but rather disconnected chaos. If we take by itself the law and order connecting the percepts, then we have nothing but abstract concepts. Reality is not contained in the abstract concept. It is, however, contained in thoughtful observation, which does not one-sidedly consider either concept or percept alone, but rather the union of the two."