King Lear of King Lear" (1949), argues that "Lear" dramatizes, among other things, the current meanings of "Nature". The words "nature," "natural" and "unnatural" occur over forty times in the play, reflecting a debate in Shakespeare's time about what nature really was like; this debate pervades the play and finds symbolic expression in Lear's changing attitude to Thunder. There are two strongly contrasting views of human nature in the play: that of the Lear party (Lear, Gloucester, Albany, Kent), exemplifying the philosophy of Bacon and Hooker, and that of the Edmund party (Edmund, Cornwall, Goneril, Regan), akin to the views later formulated
King Lear in "King Lear". Other possible sources are the anonymous play "King Leir" (published in 1605); "The Mirror for Magistrates" (1574), by John Higgins; "The Malcontent" (1604), by John Marston; "The London Prodigal" (1605); Montaigne's "Essays", which were translated into English by John Florio in 1603; "An Historical Description of Iland of Britaine" (1577), by William Harrison; "Remaines Concerning Britaine" (1606), by William Camden; "Albion's England" (1589), by William Warner; and "A Declaration of egregious Popish Impostures" (1603), by Samuel Harsnett, which provided some of the language used by Edgar while he feigns madness. "King Lear" is also a literary variant