I am made of that self mettle as my sister
And prize me at her worth. In my true heart
I find she names my very deed of love;
Only she comes too short, that I profess
Myself an enemy to all other joys
Which the most precious square of sense possesses,
And find I am alone felicitate
In your dear Highness’ love.

– William Shakespeare

King Lear, Act 1, Scene 1. Regan, not to be outdone by Goneril’s exaggerated declaration of love for Lear, tries to "one up" her sister. A hypocritical Regan suggests that Goneril’s love "comes too short" compared to hers, and that the only thing that makes her truly happy is Lear’s love. This highlights the competition between the pair, a rivalry that will climax in destructive violence in the final act, so foreshadowing the murder-suicide to come. Regan talks of having the same "mettle" as her sister, her pun on the word "metal" conveying dramatic irony. For the sisters are very much alike and both have the hardness of metal. As with Goneril, Lear rewards Regan with a large share of his kingdom, unable to distinguish between her empty flattery and the truth. Both sisters are simply trying to gain as much of his power and wealth as possible but he doesn’t see.