“There is no difference between the thumblike Vishnu in the womb of Uttara and the full-fledged Narayana in the Vaikuntha-dhama, the kingdom of Godhead. He accepts the form of archa-vigraha (worshipable Deity) just to accept service from His different incapable devotees. By the mercy of the archa-vigraha, the form of the Lord in material elements, the devotees who are in the material world can easily approach the Lord, although He is not conceivable by the material senses.” (Shrila Prabhupada, Shrimad Bhagavatam, 1.12.9 Purport)