Kautilya's Arthashastra 7.1.34

7.1.34

yadi vā manyeta "na me śaktaḥ paraḥ karmāṇy upahantuṃ nāhaṃ tasya karmopaghātī vā, vyasanam asya, śvavarāhayor iva kalahe vā, svakarmānuṣṭhānaparo vā vardhiṣye" ity āsanena vṛddhim ātiṣṭhet //

Or if a king thinks:--

"That neither is my enemy strong enough to destroy my works, nor am I his; or if he comes to fight with me, like a dog with a boar, I can increase his afflictions without incurring any loss in my own works," then he may observe neutrality and augment his own resources.