Kural - 136

The strong of soul no jot abate of 'strict decorum's' laws,
Knowing that 'due decorum's' breach foulest disgrace will cause

Explanation
Those firm in mind will not slacken in their observance of the proprieties of life, knowing, as they do, the misery that flows from the transgression from them.

Tamil Transliteration
Ozhukkaththin Olkaar Uravor Izhukkaththin
Edham Patupaak Karindhu.