। नारयोऽभिभवन्त्येतान् विष्णुपक्षानिवासुरा: ॥ २१ ॥
prītiṁ kurvanti mānavāḥ
nārayo ’bhibhavanty etān
ye — those persons who; etasmin — unto this child; mahā-bhāge — most auspicious; prītim — affection; kurvanti — execute; mānavāḥ — such persons; na — not; arayaḥ — their enemies; abhibhavanti — do overcome; etān — those who are attached to Kṛṣṇa; viṣṇu-pakṣān — the demigods, who always have Lord Viṣṇu on their side; iva — like; asurāḥ — the demons.
Demons cannot harm the demigods, who always have Lord Viṣṇu on their side. Similarly, any person or group attached to all-auspicious Kṛṣṇa cannot be defeated by enemies.
Śrīla Prabhupāda has especially indicated in this connection that just as Lord Kṛṣṇa’s associates could not be defeated by Kaṁsa, so His modern-day devotees will not be defeated by their demoniac opponents, nor will the Lord’s devotees be defeated by the internal enemies — the lusty, materialistic senses.