Kural - 673

When way is clear, prompt let your action be;
When not, watch till some open path you see

Explanation
Whenever it is possible (to overcome your enemy) the act (of fighting) is certainly good; if not, endeavour to employ some more successful method.

Tamil Transliteration
Ollumvaa Yellaam Vinainandre Ollaakkaal
Sellumvaai Nokkich Cheyal.