Thirukkural

நாடென்ப நாடா வளத்தன நாடல்ல நாட வளந்தரு நாடு.

Naatenpa Naataa Valaththana Naatalla Naata Valandharu Naatu

The learned say that those are kingdom whose wealth is not laboured for, and those not, whose wealth is only obtained through labour