"Nothing can come of nothing: speak again," the King declares after his youngest daughter, Cordelia, has refused to follow his other two children in making grand proclamations of love.
Lear is making a mistake of course, one which he will soon come to regret.
The stubborn monarch divides up his kingdom between the two daughters who don't love him and banishes the one who does. The two un-banished daughters then banish him and he starts to go mad and wanders into a storm. You know the rest, and if you don't - suffice to say it doesn't end well. Can you have spoilers on a four hundred year old play?