“Since the source of the energies is one and the same, the energies can be utilized according to the will of their source. For example, the Lord can appear in the form of the archa-vigraha, a Deity supposedly made of earth, stone or wood. Deity forms, although engraved from wood, stone or other matter, are not idols, as the iconoclasts contend.” (Shrila Prabhupada, Shri Ishopanishad, 5 Purport)