Check here for more on this issue . Show that Shakespeare does not wish us to sympathize exclusively with the various sides in this struggle, but wants to make us see that the struggle is due to a universal law of nature that overrides human hearts. Don't forget Erasmus . Compare them in terms of motives, with that of Edmund. Bradley says that the theme of Lear is the redemption of a selfish old man through love and suffering.
Bloom takes the opposite view.
Look at the ending of play carefully. Comment on the nature of insanity in the play as a motif and dramatic device. Base your answer on the whole play, especially noting what happens in V. Evaluate Cordelia's response to Lear. Gloucester straight away suspects Edgar. Faults of manner are usually less easily forgiven tha moral baseness.