I am convinced that the method of teaching which approaches most nearly
to the method of investigation is incomparably the best; since, not
content with serving up a few barren and lifeless truths, it leads to
the stock on which they grew; it tends to set the reader himself in
the track of invention, and to direct him into those paths in which the
author has made his own discoveries, if he should be so happy as to have
made any that are valuable.