Śrīla Jīva Gosvāmī explains that certain Deity forms, such as those made of sand, are manifested for a brief time to fulfill a personal desire of the worshiper. Those, however, who desire to attain pure love of God should worship the permanent form of the Deity (made, for instance, of marble, gold or brass), and they should maintain continual worship. In Kṛṣṇa consciousness there is no scope for neglecting the worship of the Supreme Personality of Godhead.