method to one's madness
A well-thought-out reason for an individual's seemingly illogical behavior.
Sometimes, I feel sure he is as mad as a hatter; and then, just as he is at his maddest, I find there is method in his madness.
madness
UK /ˈmad.nəs/ US /ˈmæd.nəs/
noun 3
Definitions
noun
1
The state of being mad; insanity; mental disease.
Though this be madneſſe, / Yet there is Method in 't: […]
You were lonely for a man I said, "Take me as I am" 'Cause you might enjoy some madness for a while
2
The state of being angry.
3
Rash folly.
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