Mahabharata 3.30.18

3.30.18

kruddho hi kāryaṃ suśroṇi na yathāvatprapaśyati |
na kāryaṃ na ca maryādāṃ naraḥ kruddho'nupaśyati || 18 ||

If a weak man, persecuted by others, foolishly becometh angry towards men that are mightier than he, he then becometh himself the cause of his own destruction. And in respect of one who thus deliberately throweth away his life, there are no regions hereafter to gain. Therefore, O daughter of Drupada, it hath been said that a weak man should always suppress his wrath. And the wise man also who though presecuted, suffereth not his wrath to be roused, joyeth in the other world--having passed his persecutor over in indifference. It is for this reason hath it been said that a wise man, whether strong or weak, should ever forgive his persecutor even when the latter is in the straits. It is for this, O Krishna, that the virtuous applaud them that have conquered their wrath. Indeed, it is the opinion of the virtuous that the honest and forgiving man is ever victorious. Truth is more beneficial than untruth; and gentleness than cruel behaviour. How can one like me, therefore, even for the purpose of slaying Duryodhana, exhibit anger which hath so many faults and which the virtuous banish from their souls? They that are regarded by the learned of foresight, as possessed of (true) force of character, are certainly those who are wrathful in outward show only. Men of learning and of true insight call him to be possessed of force of character who by his wisdom can suppress his risen wrath. O thou of fair hips, the angry man seeth not things in their true light.

The man that is angry seeth not his way, nor respecteth persons. The angry man killeth even those that deserve not to be killed. The man of wrath slayeth even his preceptors. Therefore, the man possessing force of character should ever banish wrath to a distance. The man that is overwhelmed with wrath acquireth not with ease generosity, dignity, courage, skill, and other attributes belonging to real force of character. A man by forsaking anger can exhibit proper energy, whereas, O wise one, it is highly difficult for the angry man to exhibit his energy at the proper time! The ignorant always regard anger as equivalent to energy. Wrath, however hath been given to man for the destruction of the world. The man, therefore, who wisheth to behave properly, must ever forsake anger. Even one who hath abandoned the excellent virtues of his own order, it is certain, indulgeth in wrath (if behaveth properly). If fools, of mind without light, transgress in every respect, how, O faultless one, can one like me transgress (like them)? If amongst men there were not persons equal unto the earth in forgiveness, there would be no peace among men but continued strife caused by wrath. If the injured return their injuries, if one chastised by his superior were to chastise his superior in return, the consequence would be the destruction of every creature, and sin also would prevail in the world. If the man who hath ill speeches from another, returneth those speeches afterwards;