The Fool works as the "inner conscience" of Lear throughout the play. The Fool shows Lear the side of reasoning and tries to persuade Lear that it was wrong to banish Cordelia. The Fool only first appears in Act 1, scene four, after Cordelia has moved away with the King of France. The Fool knows that Lear has done wrong by giving all his land away to his to evil daughters, Goneril and Regan, and tells him so in act one, scene four, when he says, "All thy other titles thou hast given away; that thou wast born with." The Fool also warns Lear about Goneril and Regan stating that Lear is now a lap dog to Goneril and Regan, "Truth's a dog must to kennel; he must be whipped out when the Lady Brach may stand by the fire and stink." The Fool disappears in act three, when Lear goes mad. This shows that the Fool is Lear's view of reasoning because when a person goes insane they cannot think straight or reason and therefore after act three there is no need for Lear to have a Fool as he is mad.
The Fool also tries to help Lear to feel a bit better about what is going on by putting a humorous spin on the words he is saying. The Fool uses poetry and song to get his view across to Lear. In act one, this is visible in numerous ways. For example, in scene four the Fool sings:
Then they for sudden joy did weep,
And I for sorrow sung,
That such a King should play bo-peep
And go the fools among.