On tolerance of the ill-behaved, see Tattvarthasutra 7.11,p. Therefore we should take responsibility for others' grievances against us, and avoid all temptations to self-righteousness. Analects 14.11, p. 859. Who takes vengeance or bears a grudge acts like one who, having cut one hand while handling a knife, avenges himself by stabbing the other hand. Let evil be rewarded by like evil, but he who forgives and seeks reconciliation shall be rewarded by God.
True constancy lies in forgiveness and patient forbearance.
In reconciling a great injury, Some injury is sure to remain. Muhammad in the traditions consistently praises those who would forgive rather than take revenge. On Muhammad's own forgiving nature, see Hadith, p. 569. Forty Hadith of an-Nawawi 32, p. 858. Dhammapada 252-53, p. 852, and related passages on not judging others before correcting oneself.