Respectfully Quoted: A Dictionary of Quotations. 1989.
Niccolò Machiavelli (14691527)
From this we learn that a wise prince sees to it that never, in order to attack someone, does he become the ally of a prince more powerful than himself, except when necessity forces him, as I said above. If you win, you are the powerful kings prisoner, and wise princes avoid as much as they can being in other mens power.
NICCOLÒ MACHIAVELLI, The Prince,chapter 21, in Machiavelli: The Chief Works and Others, trans. Allan Gilbert, vol. 1, pp. 8384 (1965).