Kural - 334

As 'day' it vaunts itself; well understood, 'tis knife',
That daily cuts away a portion from thy life

Explanation
Time, which shows itself (to the ignorant) as if it were something (real) is in the estimation of the wise (only) a saw which cuts down life.

Tamil Transliteration
Naalena Ondrupor Kaatti Uyir Eerum
Vaaladhu Unarvaarp Perin.