Kural - 493

E'en weak ones mightily prevail, if place of strong defence,
They find, protect themselves, and work their foes offence

Explanation
Even the powerless will become powerful and conquer, if they select a proper field (of action), and guard themselves, while they make war on their enemies.

Tamil Transliteration
Aatraarum Aatri Atupa Itanarindhu
Potraarkan Potrich Cheyin.