Cordelia's disposition is such that she is incapable of engaging in so forgivable a deception as to appease an old king's vanity and pride. Lear cannot believe this, and responds impetuously to Cordelia's response, saying "Let it be so, thy truth then be thy dower! Here I disclaim all my paternal care, propinquity, and property of blood/And as a stranger to my heart and me/Hold thee from this forever" (Act I, scene i, lines 109, 114-115). Lear, so astonished at the blunt reply from his beloved daughter, commits nothing short of an irrevocable, contemptible act: disowning the only daughter who truly loves him. Lear's impulsiveness and proclivity to commit irrational actions begin his tragic downfall. Whereas Lear simply misunderstood Cordelia's response, Gloucester received purposeful, maligning information about his legitimate son, Edgar, from his bastard son, Edmund. Edmund connives to set Edgar up, claiming that Edgar is planning on murdering Gloucester; if Edgar is out of Gloucester's favor, Edmund will be the sole heir. Upon learning of Edgar's plan, Gloucester is livid, proclaiming that Edgar is an "abhorred villain, unnatural, detested, brutish villain; worse than brutish!" Gloucester immediately trusts Edmund's account, having no reason to mistrust him, and rushes to denounce Edgar's character. Gloucester acts rather naively in not second-guessing or questioning Edgar's possible motives for murder. Gloucester, like Lear, mistakes appearance for reality in trusting Edmond and disinheriting the honest Edgar. Lear and Gloucester alike respond impetuously to inaccurate and misconstrued information, believing without a shred of doubt that their loyal offspring have betrayed them. In an effective attempt to universalize King Lear's dilemma, both Lear and Gloucester spurn their loyal and gracious children and reward their malevolent children.
The disdain Lear and Gloucester feel for Cordelia and Edgar, respectively, contrasts sharply with the deep affection and fondness the two men feel for Goneril, Regan, and Edmund.