There are many well-known quotes in King Lear - here we've listed a few of them, in order of appearance in the play.
Cordelia: Nothing.
Lear: Nothing can come of nothing, speak again. 
(Act 1 Scene 1)
Now, gods, stand up for bastards! 
(Edmund, Act 1 Scene 2)
How sharper than a serpent's tooth it is 
To have a thankless child! 
(Lear, Act 1 Scene 4)
Thou shouldst not have been old till thou hadst been wise. 
(Fool, Act, 1 Scene 5)
Blow winds and crack your cheeks! Rage, blow, 
You cataracts and hurricanoes. 
(Lear, Act 3 Scene 2)
I am a man 
More sinned against than sinning.
(Lear, Act 3 Scene 2)
As flies to wanton boys are we to th' gods: 
They kill us for their sport. 
(Gloucester, Act 4 Scene 1)
So distribution should undo excess, 
And each man have enough.
(Gloucester, Act 4 Scene 1)
They told me I was everything: 'tis a lie, I am no ague-proof.
(Lear, Act 4 Scene 5)
Get thee glass eyes, 
And like a scurvy politician seem 
To see the things thou dost not. 
(Lear, Act 4 Scene 5)
When we are born, we cry that we are come 
To this great stage of fools. 
(Lear, Act 4 Scene 5)
Men must endure 
Their going hence, even as their coming hither. 
(Edgar, Act 5 Scene 2)
When thou dost ask me blessing, I'll kneel down 
And ask of thee forgiveness. 
(Lear, Act 5 Scene 3)
Why should a dog, a horse, a rat have life, 
And thou no breath at all? 
(Lear, Act 5 Scene 3)
We that are young 
Shall never see so much, nor live so long. 
(Edgar, Act 5 Scene 3)