Mahabharata 5.131.31

5.131.31

saṃtoṣo vai śriyaṃ hanti tathānukrośa eva ca |
anutthānabhaye cobhe nirīho nāśnute mahat || 31 ||

Misbehaving in the midst of those that are good, and the destroyer of thy race and family, by bringing thee forth, O Sanjaya, I have brought forth Kali himself in the shape of a son. Oh, let no woman bring forth such a son (as thou) that art without wrath, without exertion, without energy, and that art the joy of foes. Do not smoulder. Blaze thou up, effectively displaying thy prowess. Slay thy foes. For but a moment, for ever so small a space of time, blaze thou up on the heads of thy enemies. He is a man who cherisheth wrath and forgiveth not. He, on the other hand, who is forgiving and without wrath, is neither a man nor woman. Contentment and softness of heart and these two, viz., want of exertion and fear, are destructive of prosperity. He that is without exertion never winneth what is great. Therefore, O son, free thyself, by thy own exertions, from these faults that lead to defeat and downfall. Steel thy heart and seek to recover thy own. A man is called Purusha because he is competent to trouble his foe (param). He, therefore, who liveth like a woman is misnamed Purusha (man). A brave king of mighty strength, and who moveth like a lion, may go the way of all creatures. The subjects, however, that reside in his dominions do not yet become unhappy. That king, who, disregarding his own happiness and pleasures, seeketh the prosperity of his kingdom, succeedeth soon in gladdening his counsellors and friends.'