Nimitta Kāraṇam — The Efficient Cause
Nimitta kāraṇam (Sanskrit: nimitta = occasion/reason + kāraṇam = cause; 'efficient cause') is the agent-cause — the knowing, willing intelligence that initiates, designs, and oversees creation. In contrast to the upadāna kāraṇam (material from which something is made), the nimitta is the who behind creation.
Classical Analogy: The potter is the nimitta kāraṇam of the pot — the agent who knows what to make, wills it, and acts to make it. The clay is the upadāna.
In Viśiṣṭādvaita: Bhagavān is the sole, complete nimitta kāraṇam of the universe — not an impersonal force but a personal, omniscient, omnipotent God who creates with will, wisdom, and a purpose: the jīvātmā's liberation. 'Bhagavān creates not as a potter who needs external clay but as a spider who spins the web from itself — He is both nimitta and upadāna.'
Why There Cannot Be a Separate Nimitta: Some schools posit a separate God as nimitta who works on independently existing matter. Viśiṣṭādvaita rejects this: 'If matter (acit) existed independently and eternally outside Bhagavān, Bhagavān would not be truly omnipotent — there would be something He did not create.' The Śrī Vaiṣṇava position: both cause-types are unified in Bhagavān alone.