Thirukkural

எண்ணித் துணிக கருமம் துணிந்தபின் எண்ணுவம் என்பது இழுக்கு.

Ennith Thunika Karumam Thunindhapin Ennuvam Enpadhu Izhukku

Consider, and then undertake a matter; after having undertaken it, to say "We will consider," is folly