Caitanya Caritamrta—Madhyalila-15.108—- For conditioned souls to do devotional service, deity worship is necessary.
Whether I know for my purification diksa is necessary! Taught by Srila Prabhupada of Srila Jiva Gosvami!
Srila Jiva Gosvämi explains diksä in his Bhakti-sandarbha (283):
divyam jnänam yato dadyät kuryät päpasya sanksayam
tasmäd dikseti sä proktä desikais tattva-kovidaih
“Diksä is the process by which one can awaken his transcendental knowledge and vanquish all reactions caused by sinful activity. A person expert in the study of the revealed scriptures knows this process as diksä.” ——————–————–