Kural - 305

If thou would'st guard thyself, guard against wrath alway;
'Gainst wrath who guards not, him his wrath shall slay

Explanation
If a man would guard himself, let him guard against anger; if he do not guard it, anger will kill him.

Tamil Transliteration
Thannaiththaan Kaakkin Sinangaakka Kaavaakkaal
Thannaiye Kollunj Chinam.