यदा कदा वापि विपश्चिदेषब्रह्मण्यनन्तेऽप्यणुमात्रभेदम् ।पश्यत्यथामुष्य भयं तदेवयदीक्षितं भिन्नतया प्रमादात् ॥ ३३१ ॥
In plain words
Whenever a wise person sees even the tiniest difference in infinite Brahman, that very thing, seen as separate through a lapse of attention, becomes a source of fear.
Close to the Sanskrit
Whenever this wise person sees even an atom’s measure of difference in infinite Brahman, that very thing seen as separate through negligence becomes fear for him.