Kural - 472

Who know what can be wrought, with knowledge of the means, on this,
Their mind firm set, go forth, nought goes with them amiss

Explanation
There is nothing which may not be accomplished by those who, before they attack (an enemy), make themselves acquainted with their own ability, and with whatever else is (needful) to be known, and.

Tamil Transliteration
Olva Tharivadhu Arindhadhan Kandhangich
Chelvaarkkuch Chellaadhadhu Il.