According to the statement of the Supreme Personality of Godhead, Lord Krsna, there are two classes of men. The Vedas give evidence of this, so there is no doubt about it. The living entities, who are struggling in this world with the mind and five senses, have their material bodies which are changing as long as the living entities are conditioned. One's body changes due to contact with matter; matter is changing, so the living entity appears to be changing. But in the spiritual world the body is not made of matter; therefore there is no change. In the material world the living entity undergoes six changes-birth, growth, duration, reproduction, then dwindling and vanishing. These are the changes of the material body. But in the spiritual world the body does not change; there is no old age, there is no birth, there is no death. There all exists in oneness. It is more clearly explained as sarvani bhutani: any living entity who has come in contact with matter, beginning from the first created being, Brahma, down to a small ant, is changing its body; therefore they are all fallible. In the spiritual world, however, they are always liberated in oneness.