"The nature and destiny of man is not fit between the covers of a textbook on anatomy. Likewise, the nature and fate of the aircraft can not be found on the pages of manuals Design Engineer Flight Engineering. The soul of the aircraft, which he never sees and feels - it is something that can realize the pilot: the desire to fly. It's a small part of the submission, which should not be on the drawings, but which, nevertheless, present. " (C)