Prabhupāda: We are seeing here in this material world, this apartment is better than the down apartment. So it is param. Param means better, superior quality. So here in this material world we are finding out something superior than the other, because it is relative world. But the kingdom of Godhead, Vaikuṇṭha, na yat-param: there is no more param. Finished. All param finished.
Pradyumna: Ah, nothing is superior than this.
Prabhupāda: Yes. Param. Param. You can say: "It is a very nice apartment. Why shall I (go) after Vaikuṇṭha?" But he has no idea. He thinks that "If I go to Europe, I get a better standard of living, better woman and better salary." But he has no idea what is param. Therefore, paraṁ na yat-param: there is no more superior. All superior finished. This is Bhāgavata. Paraṁ na yat-param. Final.
Final beauty, Kṛṣṇa. Final opulence, final strength, final wisdom. Everything final in Kṛṣṇa, ultimate. No more. Na yat-param. Therefore He is called Parameśvara. Īśvara means commander. There are many commander, controller, but Kṛṣṇa is called Parameśvara: "No more." And Kṛṣṇa says: mattaḥ parataraṁ nānyat (BG 7.7). Para means superior. "There is no more superior than Me." Paraṁ na yat-param.