One cannot, of course, become a scientist by merely reading science, however diligently and long. For a scientist is one who makes science, not one who learns science. A novelist is one who writes novels, not one who reads them. A contortionist is one who makes contortions, not one who watches them.
Science from the Side-Lines, The Century: A Popular Quarterly, Volume 103, November 1921 to, April 1922 (p. 473)