Kautilya's Arthashastra 7.14.2

7.14.2

bhedaṃ vā brūyāt "anapakāro yathāham etaiḥ sambhūyābhiyuktas tathā tvām apy ete saṃhitabalāḥ svasthā vyasane vābhiyokṣyante, balaṃ hi cittaṃ vikaroti, tad eṣāṃ vighātaya" iti //

Or he may tell the leader so as to break the combination: "Just as an innocent person like myself is now attacked by the combined army of these kings, so the very same kings in combination will attack you in weal or woe; for power intoxicates the mind; hence break their combination."