Kural - 272

What gain, though virtue's semblance high as heaven his fame exalt,
If heart dies down through sense of self-detected fault

Explanation
What avails an appearance (of sanctity) high as heaven, if his mind suffers (the indulgence) of conscious sin.

Tamil Transliteration
Vaanuyar Thotram Evanseyyum Thannenjam
Thaanari Kutrap Patin.