Kural - 36

Do deeds of virtue now Say not, 'To-morrow we'll be wise';
Thus, when thou diest, shalt thou find a help that never dies

Explanation
Defer not virtue to another day; receive her now; and at the dying hour she will be your undying friend.

Tamil Transliteration
Andrarivaam Ennaadhu Aranjeyka Matradhu
Pondrungaal Pondraath Thunai.