Hari-śauri: How do we understand, then, that there are peacocks and flowers and trees in the spiritual world? Are these not eternal forms?
Prabhupāda: Yes. They are more covered. Just like if you cover your body with blanket, the hands and legs are invisible. But you are not the blanket. So the trees and plants, they are more covered. They are not in full manifestation. The human form is the full manifestation of the soul.
Hari-śauri: They are covered in the spiritual world?
Madhudviṣa: He is asking if they were actually covered in the spiritual world as well.
Prabhupāda: Not in the spiritual world. There that is voluntary. Some devotee wants to serve Kṛṣṇa as flower; they become flower there. If I want that "As a flower I shall lie down at the lotus feet of Kṛṣṇa," he becomes flower, voluntarily. And he can change his..., from flower to human body. That is spiritual life. There is no restriction. If some devotee wants to serve Kṛṣṇa as cow, he serves Kṛṣṇa as cow, as calf, as flower, as plant, as water, as ground, field, or as father, as mother, as friend, as beloved, anything. Ye yathā mām prapadyante tāṁs tathaiva bhajāmy aham (BG 4.11). That is Kṛṣṇa's all-powerfulness, spiritual life.