there is reason in the roasting of eggs en · X
Etymology
Attested since the 17th century, according to the Oxford Books of Proverbs.
Meanings
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There is a reason behind even the most odd and seemingly unnecessary actions.
There is reason, it is said, in the roasting of eggs, and there is philosophy even in furniture—a philosophy nevertheless which seems to be more imperfectly understood by Americans than by any civilized nation upon the face of the earth.
1840, Edgar Allan Poe, The Philosophy of Furniture: