Kural - 891

The chiefest care of those who guard themselves from ill,
Is not to slight the powers of those who work their mighty will

Explanation
Not to disregard the power of those who can carry out (their wishes) is more important than all the watchfulness of those who guard (themselves against evil).

Tamil Transliteration
Aatruvaar Aatral Ikazhaamai Potruvaar
Potralul Ellaam Thalai.