After the game, the King and the Pawn go into the same box.
(Other Authors and Sources)
Italian proverb
Phrased as such (and noted as an Italian proverb) in H. L. Mencken, A New Dictionary of Quotations (1942). The sentiment can be found in literature back to the 17th Century. See also Omar Khayyám.
More discussion: When the Chess Game Is Over, the King and the Pawn Go Back in the Same Box – Quote Investigator.