Kural - 261

To bear due penitential pains, while no offence
He causes others, is the type of 'penitence'

Explanation
The nature of religious discipline consists, in the endurance (by the ascetic) of the sufferings which it brings on himself, and in abstaining from giving pain to others.

Tamil Transliteration
Utranoi Nondral Uyirkkurukan Seyyaamai
Atre Thavaththir Kuru.