p. 260
सत्यात् सत्यज्ञानादिलक्षणात् ब्रह्मणः प्रच्यवमानानां स्वाभाविकब्रह्मभावपरित्यागेन अनात्मनि देहादावात्मभावमापन्नानां संकल्पा वितथा अभवन् व्यर्था भवन्ति, स्वाभाविक
In plain words
They slip away from Brahman — from the Real, from what reality and knowledge themselves define. They let go of being Brahman, which was theirs by nature all along, and take up the sense of 'I' in what is not the Self at all: the body, and everything after it. And so, the verse says, their intentions turned false — meaning they come to nothing. Natural—
Close to the Sanskrit
Of those falling away from Brahman — from the Real, from that whose defining marks are reality, knowledge, and the rest — of those who, by the complete abandonment of their innate state of being Brahman, have come to hold the notion of self in the non-Self, in the body and the rest: their intentions became false, that is, they become futile. Natural—