… is from page 38 of an October 1919 piece by H.L. Mencken in the Smart Set, as an excerpt of this piece is reprinted in A Second Mencken Chrestomathy (1995):
Nothing, in fact, could be more commonplace than the observation that the crazes which periodically ravage the proletariat are, in the main, no more than distorted echoes of delusions cherished centuries ago.