He's mad that trusts in the tameness of a wolf
"He's mad that trusts in the tameness of a wolf, a horse's
a boy's love, or a whore's oath."
The fool in Shakespeare's plays often serves as the person who
sees things in the most honest way. In King Lear, his jester has
been delivering stinging lines that get to the bottom of the truth,
the most obvious being how King Lear gave away his kingdom to
ungrateful daughters who have now demeaned and humiliated him. Lear
has run out into a raging storm, wandering wildly and naked on the
heath, sinking into madness over the ingratitude of his children.
He is pulled at last into a farmhouse where his fool, the only
person allowed to be frank with King Lear, continues to chide him
about his character.