There are aphorisms that, like airplanes, stay up only while they are in motion.
Source: Koncheyev, in The Gift, ch. 1 (1937; tr. 1963).
-- Vladimir Nabokov, (Apr 23 1899-1977), Russian-U. S. novelist; He was the foremost of the post-1917 immigrant authors; his works include Lolita, 1955.