Kṛṣṇa describes the ecological and spiritual cycle that sustains life. Living beings depend on food, food depends on rain, rain depends on sacrifice, and sacrifice depends on the performance of prescribed duties. This is the cosmic chain of command. This verse links the economy (food) to ecology (rain) to spirituality (sacrifice) and sociology (duty). If any one link in this chain is broken, the entire system collapses. If people stop doing their honest work, the ‘Yajña’ stops. When sacrifice stops, the natural order is disturbed, and life suffers. Kṛṣṇa is telling Arjuna that his individual work is essential for the harmony of the whole universe. He cannot view his decision to fight as a private matter. He is a key link in the chain that keeps the world running. To quit is to sabotaging the very life-support system of the planet.