Kural - 357

The mind that knows with certitude what is, and ponders well,
Its thoughts on birth again to other life need not to dwell

Explanation
Let it not be thought that there is another birth for him whose mind having thoroughly considered (all it has been taught) has known the True Being.

Tamil Transliteration
Orththullam Ulladhu Unarin Orudhalaiyaap
Perththulla Ventaa Pirappu.