This verse is the grand conclusion of Krishna's discourse on the nature of the Self (verses 11-30). It is both a summary and a universalization of everything that has been said. The key word is 'sarvasya' — in every body. Not just Arjuna's body, not just Bhishma's body, not just the bodies of warriors on the battlefield — the inviolable Self dwells in every body, in every being, everywhere. The conclusion is therefore absolute: you should not grieve for any being (sarvani bhutani). Shankara reads this as the definitive statement of the universal Atman: since the same indestructible Self inhabits all bodies, grief for any particular body's destruction is based on ignorance. Ramanuja sees this as the Lord's universal assurance: every soul in every body is eternally protected by God, and therefore grief for any soul is unfounded. The Bhakti tradition finds here the basis for universal compassion: if the same divine Self inhabits every being, then every being is sacred. Vivekananda built his entire social philosophy on this verse: if the Self in the king and the Self in the servant are the same and equally inviolable, then social inequality is a violation of spiritual reality. This verse is not just a consolation for Arjuna — it is a charter for the equal dignity of all beings.