A prakrta devotee, or neophyte devotee, is still on the material platform. He certainly engages in worshiping the Deity, but he cannot appreciate the activities of a pure devotee. It has actually been seen that even an authorized devotee who is engaged in the service of the Lord by preaching the mission of Krsna consciousness is sometimes criticized by neophyte devotees. Such neophytes are described by Visvanatha Cakravarti Thakura: sarva-prani-sammananasamarthanam avajna spardhadimatam tu bhagavat-pratimaiva patram ity aha. For those who cannot properly appreciate the activities of authorized devotees, Deity worship is the only way for spiritual advancement. In the Caitanya-caritamrta (Antya 7.11) it is clearly said, krsna-sakti vina nahe tara pravartana: without being authorized by Krsna, one cannot preach the holy name of the Lord throughout the entire world. Nevertheless, a devotee who does so is criticized by neophyte devotees, kanistha-adhikaris, who are on the lower stages of devotional service. For them, Deity worship is strongly recommended.

Srila Prabhupada, SB 7.14.39, ppt.