Śrīmad-Bhāgavatam · Text 6.10.28
Who is speaking and story frame
सर्वे प्रयासा अभवन् विमोघा:
कृता: कृता देवगणेषु दैत्यै: ।
कृष्णानुकूलेषु यथा महत्सु
क्षुद्रै: प्रयुक्ता ऊषती रूक्षवाच: ॥ २८ ॥
sarve prayāsā abhavan vimoghāḥ
kṛtāḥ kṛtā deva-gaṇeṣu daityaiḥ
kṛṣṇānukūleṣu yathā mahatsu
kṣudraiḥ prayuktā ūṣatī rūkṣa-vācaḥ
When insignificant persons use rough words to cast false, angry accusations against saintly persons, their fruitless words do not disturb the great personalities. Similarly, all the efforts of the demons against the demigods, who were favorably situated under the protection of Kṛṣṇa, were futile.
Read Śrīla Prabhupāda's purport on Vedabase.io