Kural - 102

A timely benefit, -though thing of little worth,
The gift itself, -in excellence transcends the earth

Explanation
A favour conferred in the time of need, though it be small (in itself), is (in value) much larger than the world.

Tamil Transliteration
Kaalaththi Naarseydha Nandri Siridheninum
Gnaalaththin Maanap Peridhu.