Saying that each of two atoms can attain closed electron shells by sharing a pair of electrons is equivalent to saying that husband and wife, by having a total of two dollars in a joint account and each having six dollars in individual bank accounts, have eight dollars apiece!
Quoted in Reynold E. Holmen, 'Kasimir Fajans (1887–1975): The Man and His Work', Bulletin for the History of Chemistry, 1990, 6, 7–8
