“Bhagavad-gita also confirms that when the Lord appears He appears as He is by His internal potency. He is not contaminated by the material energy because He is the Lord of material energy. In the Vedic literature we find that His whole embodiment is spiritual. He has His eternal form called sach-chid-ananda-vigraha.” (Shrila Prabhupada, Bhagavad-gita, 13.15 Purport)