Śrīla Prabhupāda purified not only this world but all the three worlds. Even great demigods would come to join his chanting and to hear him speak. Prabhupāda could see them, but we could not.
When Śrīla Prabhupāda was once brought to speak at a large hall, empty except for seven people, the devotees were remorseful. But Prabhupāda said, “Did you not see Nārada there? Did you not see Brahmā?” (Śrīla Prabhupāda-līlāmṛta, Ch 21)
After Śrīla Prabhupāda delivered a particularly powerful lecture in Tokyo, a Japanese man asked, “I always want to ask whether if you meet demigods, or Indra, or Brahmā, or . . .”
“What is the use?” Prabhupāda replied. “They may come to see me—‘Oh, he is known to the emperor’—they may come to see me. I cannot go to see them. And we have no want. Why shall I see the demigods? We have no want. Kṛṣṇa knows. What is our business? Our business is to spread the glories of Kṛṣṇa. We are directly in the service of Kṛṣṇa, so whatever is wanted, He will supply. Why shall I go to somebody? It is His business. So for a devotee there is no need of meeting. We have all respect for them, but there is no need of meeting any demigod. Why should I bother my head for meeting the demigods?” (Lecture, 28 January 1975)