Chapter III · Śloka 15
कर्म ब्रह्मोद्भवं विद्धि ब्रह्माक्षरसमुद्भवम् |
तस्मात्सर्वगतं ब्रह्म नित्यं यज्ञे प्रतिष्ठितम् ||
तस्मात्सर्वगतं ब्रह्म नित्यं यज्ञे प्रतिष्ठितम् ||
karma brahmodbhavaṃ viddhi brahmākṣara-samudbhavam |
tasmāt sarva-gataṃ brahma nityaṃ yajñe pratiṣṭhitam ||
tasmāt sarva-gataṃ brahma nityaṃ yajñe pratiṣṭhitam ||
Know that action arises from Brahman, and Brahman arises from the Imperishable. Therefore the all-pervading Brahman is eternally established in sacrifice.
The chain ascends: food, rain, sacrifice, action, Brahman (the Vedas / cosmic order), and the Imperishable Absolute. Sacrifice is the point where the human and the eternal meet — the hinge of the whole system.