When one reads the history of science one has the exhilarating feeling of climbing a big mountain. The history of art gives one an altogether different impression. It is not at all like the ascension of a mountain, always upward whichever the direction of one's path; it is rather like a leisurely journey across a hilly country.
The History of Science and the New Humanism, Chapter I (p. 25), H. Holt & Co. 1931