Definition of "plenteousness"

Few, save the poor, feel for the poor:The rich know not, how hard It is to be of needful foodAnd needful rest debarred.Their paths are paths of plenteousness,They sleep on silk and down;And never think how heavilyThe weary head lies down.

1837, L[etitia] E[lizabeth] L[andon], “The Fête at Sir Robert Walpole’s”, in Ethel Churchill: Or, The Two Brides. […], volume III, London: Henry Colburn, […], page 31