method in (to) one's madness
method in (to) one's madness {n. phr.}
A plan or organization of ideas hard to perceive at first, but that becomes noticeable after longer and closer examination.
We thought he was crazy to threaten to resign from the university but, when he was offered a tenured full professorship, we realized that there had been method in his madness.
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Source: A Dictionary of American Idioms
