A Lacuna in the Book of Genesis?

C.S. Lewis, letter to his father (July 19? 1915): However, this I suppose is part of the curse inherited from our first parents: my private opinion is that after the words 'In the sweat of thy brow shalt thou earn thy bread' [Genesis 3:19] another clause has dropped out from the original text, running 'In the exasperation of thy souls shalt thou attend social functions'.