Mahabharata 2.16.9

2.16.9

atha cettaṃ nihatyājau śeṣeṇābhisamāgatāḥ |
prāpnuyāma tataḥ svargaṃ jñātitrāṇaparāyaṇāḥ || 9 ||

"Vasudeva said,--'Arjuna hath indicated what the inclination should be of one that is born in the Bharata race, especially of one who is the son of Kunti. We know not when death will overtake us, in the night or in the day. Nor have we ever heard that immortality hath been achieved by desisting from fight. This, therefore, is the duty of men, viz., to attack all enemies in accordance with the principles laid down in the ordinance. This always gives satisfaction to the heart. Aided by good policy, if not frustrated by Destiny, an undertaking becomes crowned with success. If both parties aided by such means encounter each other, one must obtain ascendency over the other, for both cannot win or lose. A battle however, if directed by bad policy which again is destitute of the well-known arts, ends in defeat or destruction. If, again, both parties are equally circumstanced, the result becomes doubtful. Both, however, cannot win. When such is the case, why should we not, aided by good policy, directly approach the foe; and destroy him, like the current of the river uprooting a tree? If, disguising our own faults, we attack the enemy taking advantage of his loopholes, why should we not succeed? Indeed, the policy of intelligent men, is that one should not fight openly with foes that are exceedingly powerful and are at the head of their well-arrayed forces. This too is my opinion. If, however, we accomplish our purpose secretly entering the abode of our foe and attacking his person, we shall never earn obloquy. That bull among men--Jarasandha--alone enjoyeth unfaded glory, like unto him who is the self in the heart of every created being. But I see his destruction before me. Desirous of protecting our relatives we will either slay him in battle or shall ascend to heaven being ourselves slain in the end by him.'