Śāṣvatam means original. It's not that Rāma and Kṛṣṇa, as the Māyāvādī philosophers says, that the impersonal Brahman appears in form. This is rascaldom. Actually, He appears in His own form, as it is stated in the Bhagavad-gītā, sambhavāmy ātma-māyayā (BG 4.6). We are . . . we are accepting this form not by our own potency. I have accepted this body, you have accepted this body, not by your own will. You have been forced to accept a particular type of body according to your work. You cannot make choice. Otherwise, everyone would have made his choice to take birth in America or some place like that, or heavenly planets. Oh, that is not choice. Just like if the foreigners, they apply for immigration, there is . . . the choice depends on the highest authority.
So similarly, this body is not śāśvatam. It is not my original body. This body is changing. I may have this body this time; I may have another body, another species of life; therefore it is not śāśvatam. But the Lord's body is śāśvatam. As it is confirmed in the Bhagavad-gītā, śāśvataṁ puruṣam, and He is enjoyer. So the same word is used here. Śāntaṁ śāśvatam aprameyam. Aprameyam means that cannot be measured.
The Māyāvādīs, they cannot conceive how immeasurable, unlimited. Therefore as soon as they take it that God is unlimited, immeasurable, they take it for impersonal. They cannot conceive that God can assume any extensive form without any difficulty. Just like He appeared as Hiraṇya . . . I mean to say, Varāhadeva. The Varāhadeva, He appeared in such a gigantic body that He could lift this whole planet by His tusk. So just imagine how much great body He assumed. So aprameyam.
Another, He can assume so small body. Just like Parīkṣit Mahārāja, when he was within the womb of his mother, attacked by the atomic energy, so Kṛṣṇa entered the womb of his mother and saved him. Just imagine how small He became. Therefore aprameyam means you cannot measure how He is small, how He is great.