Meaning: The quote "How sharper than a serpent's tooth it is to have a thankless child!" is from Act 1, Scene 4 of William Shakespeare's play "King Lear." This line is spoken by King Lear himself as he laments the ingratitude and betrayal of his daughters, particularly his youngest daughter Cordelia, whom he feels has been ungrateful and disloyal despite his love and generosity towards her.

In this powerful metaphor, Shakespeare compares the pain of having an ungrateful child to the sharpness of a serpent's tooth. The imagery of a serpent's tooth is particularly evocative, as serpents are often associated with deceit and betrayal, and their teeth are symbolic of their ability to inflict harm. By using this metaphor, Shakespeare effectively conveys the deep emotional anguish and betrayal that King Lear feels as a result of his daughters' ingratitude.

The theme of ingratitude and filial betrayal is a central and recurring motif throughout "King Lear." The play explores the complexities of familial relationships, particularly the dynamics between parents and their children. King Lear's experience of being betrayed by his own flesh and blood serves as a poignant reminder of the fragility of trust and the pain that can result from ungratefulness.

The quote also highlights the universal and timeless nature of the human experience. The pain of betrayal and ingratitude is something that resonates with audiences across different cultures and time periods. Shakespeare's exploration of this theme continues to be relevant and relatable, as it taps into the profound emotional impact of familial relationships and the vulnerabilities that come with loving and trusting others.

Moreover, the quote reflects the broader thematic concerns of the play, such as the nature of power, the consequences of pride and arrogance, and the complexities of human relationships. King Lear's journey serves as a cautionary tale about the perils of misplaced trust and the devastating effects of ingratitude and betrayal.

In addition to its thematic significance, the quote also showcases Shakespeare's masterful use of language and imagery. The juxtaposition of the sharpness of a serpent's tooth with the concept of filial ingratitude creates a vivid and visceral image that resonates with the audience. It is through such powerful and evocative language that Shakespeare captures the depth of human emotions and experiences, leaving a lasting impact on his readers and audiences.

In conclusion, the quote "How sharper than a serpent's tooth it is to have a thankless child!" from "King Lear" encapsulates the profound emotional pain and betrayal experienced by the character of King Lear. Through this powerful metaphor, Shakespeare delves into the complexities of familial relationships, the fragility of trust, and the enduring impact of ingratitude and betrayal. The quote serves as a poignant reminder of the universal and timeless nature of human emotions and experiences, while also showcasing Shakespeare's unparalleled ability to capture the depth of human suffering through his language and imagery.