Iamblichus

The Syrian who broke with Porphyry on the decisive question: can contemplation alone raise the soul? Iamblichus said no — the soul is too fully descended to think its own way home, so the gods gave theurgy, "divine work": rites, names, symbols and material things that carry a divine signature and act where the intellect cannot reach. This is the exact argument the Kabbalah makes for the commandments, and it is why Neoplatonism could become a mysticism of practice rather than only of philosophy.