Kural - 288

As virtue dwells in heart that 'measured wisdom' gains;
Deceit in hearts of fraudful men established reigns

Explanation
Deceit dwells in the mind of those who are conversant with fraud, even as virtue in the minds of those who are conversant with rectitude.

Tamil Transliteration
Alavarindhaar Nenjath Tharampola Nirkum
Kalavarindhaar Nenjil Karavu.