Kural - 297

If all your life be utter truth, the truth alone,
'Tis well, though other virtuous acts be left undone

Explanation
If a man has the power to abstain from falsehood, it will be well with him, even though he practise no other virtue.

Tamil Transliteration
Poiyaamai Poiyaamai Aatrin Arampira
Seyyaamai Seyyaamai Nandru.