Thirukkural-On Virtue-Not Causing Injury-Kural 312

Even to a man who maliciously did him harm, the righteous man's ideal is not to return evil.

From the stage of just not doing harm to any one, valluvar here, develops his idea to the level of not returning evil even to the one who hurts, with malice in his heart. In kural 314 he goes one step further and says pointedly that it is the right thing, in addition, to do a good turn to such a man.

It is not only Solomon the Wise, who said in his proverbs, 'It is the glory of man to pass over transgressions'. Seneca said about the wise and the great that 'injuries do not exist for them'.

Even a man of worldly wisdom like the Duke of Edinburgh, rose in stature by humorously admonishing the Argentinian students who threw eggs at him, in a classic note, saying, 'Do not throw any more eggs because I have only a limited supply of suits'.

(quoted by the late K M Balasubramaniam)

Forgiveness of injuries, along with humility and charity, are according to Sir. A Grant, 'Christian qualities which are, not described by Aristotle'. In the East, however, Lao Tse taught it. (Ref: Kural 314) The Greek Philosophers were more concerned with the ideal conduct of a superior citizen trying to perfect himself. The Stoics of Rome, who followed, conceded that these virtues were attainable by all men. But these virtues really form the bedrock of Christian morality, based on religious motives and the concept of the Kingdom of God. For the key note to this exalted way was set by the Lord Jesus Christ himself, when he pleaded for his persecutors while hanging on the cross – 'Father forgive them, they know not what they do'.
(Luke 23:34)

This was example in keeping with precept, for Christ had taught,

'Love your enemies and pray for
those who persecute you'.

(Matt 5:44)

Valluvar, however, apparently arrived at the same idea of returning good for evil, proceeding from a rational angle. The only difference is that he put it down primarily as the ascetic's virtue.

Naladiar would say that it is the mark of a noble character to forget injuries.

Aaatraamai naerthinaamatravar seythakkaal thaamavaraip

Paerthinaa seyaamai nanruda

(Naaladi 67)