Thirukkural

நன்றே தரினும் நடுவிகந்தாம் ஆக்கத்தை அன்றே யொழிய விடல்.

Nandre Tharinum Natuvikandhaam Aakkaththai Andre Yozhiya Vital

Forsake in the very moment (of acquisition) that gain which, though it should bring advantage, is without equity