Kautilya's Arthashastra 7.1.22

7.1.22

"āśutarā me vṛddhir bhūyastarā vṛddhyudayatarā vā bhaviṣyati, viparītā parasya" iti jñātvā paravṛddhim upekṣeta //

Whoever thinks himself to be growing in power more rapidly both in quality and quantity (than his enemy), and the reverse of his enemy, may neglect his enemy's progress for the time.