A quote from Shakespeare's King Lear, which comes (and this will later be important) in Act 3, Scene 4:
In such a night
To shut me out! Pour on; I will endure.
In such a night as this! O Regan, Goneril!
Your old kind father, whose frank heart gave all,--
O, that way madness lies; let me shun that;
No more of that.