Tiruvalluvar

“ In soul by tongue inflamed, the ulcer healeth never more.
The wound which has been burnt in by fire may heal, but a wound burnt in by the tongue will never heal.
Kural-130
Who learns restraint, and guards his soul from wrath,
Virtue, a timely aid, attends his path.
Virtue, seeking for an opportunity, will come into the path of that man who, possessed of learning and self-control, guards himself against anger. ”

“ Your self-repression known will yield you glory's gain.
Knowing that self-control is knowledge, if a man should control himself, in the prescribed course, such self-control will bring him distinction among the wise. ”

“ In his station, all unswerving, if man self subdue,
Greater he than mountain proudly rising to the view.
More lofty than a mountain will be the greatness of that man who without swerving from his domestic state, controls himself. ”