p. 302
उभौ लोकौ इहलोकपरलोकौ विद्यया ब्रह्मात्मैकत्वविषयया व्याप्य याति तत् पूर्णानन्दं ब्रह्म ।यस्मादुभौ लोकौ विद्यया
In plain words
Both worlds — meaning this one and the one after — he pervades by knowledge, the knowledge whose whole subject is that Brahman and the Self are one; and pervading them, he reaches that Brahman which is bliss entire. Because both worlds, by knowledge—
Close to the Sanskrit
Both worlds — that is, this world and the world beyond — having pervaded by knowledge, namely the knowledge whose object is the oneness of Brahman and the Self, he goes to that Brahman which is full bliss. Because both worlds, by knowledge—