Kural - 282

'Tis sin if in the mind man but thought conceive;
'By fraud I will my neighbour of his wealth bereave.'

Explanation
Even the thought (of sin) is sin; think not then of crafiily stealing the property of another.

Tamil Transliteration
Ullaththaal Ullalum Theedhe Piranporulaik
Kallaththaal Kalvem Enal.