That Supreme Person, oh Pārtha!, is attainable only by devotion without other object, in whom all beings are situated and by whom all this is permeated.

Sa paraḥ puruṣaḥ — that supreme Puruṣa. How to reach Him? Ananyayā bhaktyā — by devotion without “other” (an-anya), exclusive, not shared with other objects.

Attributes: yasya antaḥ-sthāni bhūtāni — in whose interior all beings are situated (like trees in earth). Yena idaṃ sarvam tatam — by whom all this is woven/extended (like thread in cloth). He is both immanent and transcendent.