Some Ans. Questions 1908 by -'Abdu'l-Bahá- 1 Para

For example, if someone oppresses, injures and wrongs another, and the wronged man retaliates, this is vengeance and is censurable. If the son of 'Amr kills the son of Zayd, Zayd has not the right to kill the son of 'Amr; if he does so, this is vengeance. If ' Amr dishonors Zayd, the latter has not the right to dishonor 'Amr; if he does so, this is vengeance, and it is very reprehensible. No, rather he must return good for evil, and not only forgive, but also, if possible, be of service to his oppressor. This conduct is worthy of man. for what advantage does he gain by vengeance? The two actions are equivalent; if one action is reprehensible, both are reprehensible. The only difference is that one was committed first, the other later (269:2)

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