"that way madness lies"
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King Lear and the Fool in the Storm
Public DomainKing Lear and the Fool in the Storm - Credit: William Dyce

A quote from Shakespeare's King Lear, which comes (and this will later be important) in Act 3, Scene 4:

 

KING LEAR

                         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.