Arjuna and the Hunter 1.30

1.30

vrajanti te mūḍhadhiyaḥ parābhavaṃ bhavanti māyāviṣu ye na māyinaḥ
praviśya hi ghnanti śaṭhās tathāvidhān asaṃvṛtāṅgān niśitā iveṣavaḥ //

Those fools meet with defeat / who do not become deceitful toward the deceitful; / for rogues enter and destroy such men / whose bodies are unguarded, as sharp arrows do.