एकं विषरसो हन्ति शस्त्रेणैकश्च हन्यते |
सबंधुराष्ट्रं राजानं हन्त्येको मंत्रविप्लवः ||
Poison kills only one person (the one who drinks it). Weapons can kill only one (or few). But a rogue thought in a king's mind can kill the king along with all his relatives, subjects and his kingdom.