Death and life, pleasure and pain, those pairs — knowing that they are always in one body, let him remain absorbed in samādhi.

This verse points to the dvandvas — the pairs of opposites that structure ordinary experience.Death and life (maraṇa-jīvana), pleasure and pain (sukha-duḥkha) — these polarities seem irreconcilable from the conventional perspective.

Yogic wisdom recognizes that both poles coexist ekadehe — in a single body.They are not external to the experiencer;They are modalities of the same embodied experience.The body that lives is the same that will die;The body that feels pleasure is the same one that will feel pain.

Buddhvā — having known, having awakened to — this realization transforms the relationship with opposites.The yogi does not seek only one pole (life, pleasure) while rejecting the other (death, pain).He transcends them both by remaining (nirata) in samādhi.From that perspective, opposites reveal their underlying unity: changing manifestations of the unchanging consciousness that witnesses them.