Krishna fulfills His servants' promises while simultaneously destroying demons and saving devoted souls through His all-powerful intelligence.Listen — Srila Prabhupada Uvaca
Puṣṭa Kṛṣṇa: Translation: "O the unlimited reservoir of transcendental qualities, my Lord, You have killed my father, Hiraṇyakaśipu, and saved my life from the sword of my father. And he said very angrily, 'If there is any other supreme controller than myself, then let Him save you. I shall now separate your head from the body.' Therefore, for both reasons, I consider that You have acted at present just to prove the words of Your devotee truthfully, and there is no other cause." Prabhupāda: mat-prāṇa-rakṣaṇam ananta pitur vadhaś ca manye sva-bhṛtya-ṛṣi-vākyam ṛtaṁ vidhātum khaḍgaṁ pragṛhya yad avocad asad-vidhitsus tvām īśvaro mad-aparo 'vatu kaṁ harāmi [SB 7.9.29] So before Hiraṇyakaśipu was killed by His Lordship Nṛsiṁhadeva, Prahlāda Mahārāja never addressed his father as "father," pituḥ. Now, after his death, he is addressing pituḥ, "my father." Because before his death he was demon.
Everyone knows. But if a demon is killed by the Supreme Personality of Godhead, he becomes liberated—either demon or anyone. Demons are generally killed by the Supreme Personality of Godhead. They enter into the impersonal Brahman.
Therefore there is a verse—I don't remember exactly now—that "The monist and the demons, they go to the same place: impersonal Brahman." And what to speak of devotees? Devotees never enter to that impersonal Brahman. Devotees enter directly in the Vaikuṇṭha planet. Mām eti.
Mām eti. Kṛṣṇa said, tyaktvā dehaṁ punar janma naiti mām eti [Bg 4.9]. Yad gatvā na nivartante tad dhāmaṁ paramaṁ mama [Bg 15.6]. If you enter the Vaikuṇṭha planets... There are innumerable Vaikuṇṭha planets, and above them there is the Goloka Vṛndāvana planet, Kṛṣṇaloka.
So in either of them if you enter, then that is not impersonal. Personal. Impersonal Brahman is outside. Although impersonal Brahman is also spiritual existence, but it is outside the Vaikuṇṭha planets. So the demons and the impersonalists, they cannot enter into the Vaikuṇṭha planet.
And because they cannot enter into the Vaikuṇṭha planet, they again fall down, again fall down in this material world. Āruhya kṛcchreṇa paraṁ padaṁ tataḥ patanty adho 'nādṛta-yusmad-aṅghrayaḥ [SB 10.2.32]. Patanty adhaḥ. Adhaḥ means in this material world. Those who are impersonalists, they may enter into the Brahman effulgence, āruhya kṛcchreṇa, with severe execution of penance and austerities.
The Māyāvādīs, they perform severe austerity. Those who are actually Brahmavādī, their mode of life is very, very strict and severe also. So even after severe penances and austerities one enters into the Brahman effulgence, there is no security. Āruhya kṛcchreṇa paraṁ padaṁ tataḥ. Why they come down?