In the Puranas it is stated that another demigod is supreme just to convince the devotee. Just like a student in primary school, he thinks the primary education is everything and has no idea of higher education. This is to convince the devotees but from the Gita we understand that it is from Krishna that He gives the faith by which one can worship the demigods. Krishna says "aham adi hi devanam.'' Is Krishna speaking a lie? "mattah parataram nanyat [Bg. 7.7].'' Nobody is greater than Me, He says. Why should we reject Krishna's statement? Our mission is to put Krishna as first, and they may take it or not. We do not interfere with their choice, but we do it as our duty.
Letter to His Holiness Satsvarupa das Goswami, 3 November, 1974