Kural - 29

The wrath 'tis hard e'en for an instant to endure,
Of those who virtue's hill have scaled, and stand secure

Explanation
The anger of those who have ascended the mountain of goodness, though it continue but for a moment, cannot be resisted.

Tamil Transliteration
Kunamennum Kundreri Nindraar Vekuli
Kanameyum Kaaththal Aridhu.