Matsyapurana 160.8

160.8

duṣprekṣyo bhāskaro bālas tathāhaṃ durjayaḥ śiśuḥ
alpākṣaro na mantraḥ kiṃ susphuro daitya dṛśyate //

Hearing these words, that Kumâra also said words which were gratifying to the Devas—' Târakâsura ! now hear the meaning of the Śâstras. During war time, the learned do not understand the real meaning of the writings of the scriptures You should not look down on Me, as a mere child A cobra may be a very young one, see the Sun though he may be small yet cannot be looked at. O Demon ! have you not seen how a mantra of very few syllables contains wonderful force ?—6-8