Thirukkural

பழையம் எனக்கருதிப் பண்பல்ல செய்யும் கெழுதகைமை கேடு தரும்.

Pazhaiyam Enakkarudhip Panpalla Seyyum Kezhudhakaimai Ketu Tharum

The (foolish) claim with which a minister does unbecoming acts because of his (long) familiarity (with the king) will ensure his ruin