Prabhupada's lecture - Śrīmad-Bhāgavatam 1.8.44 - Māyāpura, October 24, 1974
So Kuntī has all along... Very selected words she used. That we should learn. That is the injunction of the śāstras, uttama-śloka. Therefore Kṛṣṇa's another name is bhagavaty uttama-śloke bhaktir bhavati naiṣṭhikī [SB 1.2.18]. The best words. Actually, if you love somebody, out of love you cannot use anything, means any word, which is not very much appreciated. So... And they are all applicable. It is not like the logic, kāṇa-chelera nāma padma-locana(?): one man has got a child who is blind, but he has given the name Padma-locana, "lotus-eyed." Not like that. The selected words which Kuntī has used, it is not improper. They are properly used. Just like here is one word used, Vaikuṇṭha. Kṛṣṇa's another name is Vaikuṇṭha, or God's another name is Vaikuṇṭha. Vaikuṇṭha means vigata-kuṇṭha hy asmāt. Therefore spiritual world is called Vaikuṇṭha. And the material world is duḥkhālayam aśāśvatam [Bg. 8.15].
It is not Vaikuṇṭha. You cannot even walk without anxiety. Just like we were walking on the street, and the leg slipped. So we should be very much careful even in walking. Beginning from your morning walk, you are full of anxiety. But Vaikuṇṭha means no anxiety, no anxiety. That is spiritual world. We must understand what is Vaikuṇṭhaloka, and what is Jaḍaloka.