Kural - 435

His joy who guards not 'gainst the coming evil day,
Like straw before the fire shall swift consume away

Explanation
The prosperity of him who does not timely guard against faults, will perish like straw before fire.

Tamil Transliteration
Varumunnark Kaavaadhaan Vaazhkkai Erimunnar
Vaiththooru Polak Ketum.