Mbh 3.33.2c

Strong men, O monarch, engage in battle depending on their might, and not on the force of numbers nor on information of the enemy’s plans procured through spies. Therefore, O son of Pandu exert thy might. Might is the root of wealth. Whatever else is said to be its root is really not such. As the shade of the tree in winter goeth for nothing, so without might everything else becometh fruitless. Wealth should be spent by one who wisheth to increase his wealth, after the manner, O son of Kunti, of scattering seeds on the ground. Let there be no doubt then in thy mind. Where, however, wealth that is more or even equal is not to be gained, there should be no expenditure of wealth. For investment of wealth are like the ass, scratching, pleasurable at first but painful afterwards. Thus, O king of men, the person who throweth away like seeds a little of his virtue in order to gain a larger measure of virtue, is regarded as wise. Beyond doubt, it is as I say. They that are wise alienate the friends of the foe that owneth such, and having weakened him by causing those friends to abandon him thus, they then reduce him to subjection. Even they that are strong, engage in battle depending on their courage. One cannot by even continued efforts (uninspired by courage) or by the arts of conciliation, always conquer a kingdom. Sometimes, O king, men that are weak, uniting in large numbers, slay even a powerful foe, like bees killing the despoiler of the honey by force of numbers alone. (As regards thyself), O king, like the sun that sustaineth as well as slayeth creatures by his rays, adopt thou the ways of the sun. To protect one’s kingdom and cherish the people duly, as done by our ancestors, O king, is, it hath been heard by us, a kind of asceticism mentioned even in the Vedas. By ascetism, O king, a Kshatriya cannot acquire such regions of blessedness as he can by fair fight whether ending in victory or defeat.