Thirukkural

நில்லாத வற்றை நிலையின என்றுணரும் புல்லறி வாண்மை கடை.

Nillaadha Vatrai Nilaiyina Endrunarum Pullari Vaanmai Katai

That ignorance which considers those things to be stable which are not so, is dishonourable (to the wise)