The concept of "filial ingratitude" is comes up.
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When Kent asks Lear to enter the hovel at the beginning of Act 3, scene 4, Lear’s reply demonstrates that part of his mind is still lucid and that the symbolic connection between the storm outside and Lear’s own mental disturbance is significant. Lear explains to Kent that although the storm may be very uncomfortable for Kent, Lear himself hardly notices it: “The tempest in my mind / Doth from my senses take all feeling else” (3.4.13–14). Lear’s sensitivity to the storm is blocked out by his mental and emotional anguish and by his obsession with his treacherous daughters. The only thing that he can think of is their “filial ingratitude” (3.4.15).
Also it is this irony of “filial ingratitude” that humanizes King Lear at the same time. After he sends his Fool into the hovel to take shelter, he kneels in prayer—the first time we have seen him do so in the play. He does not pray for himself; instead, he asks the gods to help “poor naked wretches, wheresoe’er you are, / That bide the pelting of this pitiless storm” (3.4.29–30). Reproaching himself for his heartlessness, Lear urges himself to “expose thyself to feel what wretches feel” (3.4.35). This self-criticism and newfound sympathy for the plight of others mark the continuing humanization of Lear.