Sri Caitanya Mahaprabhu while instructing Srila Rupa Gosvami, has said how the seed of devotional service sprouts and increases by watering the root by the process of sravanam kirtanam. So, these two items are very important in devotional service, but that does not mean that the other items are inferior. Srila Jiva Gosvami has stressed kirtanam especially in the age of Kali. Even if there is arcanam for sanctifying the contaminated mind, it must be accompanied by sravanam kirtanam.
Letter to Satsvarupa Maharaja, 19 January, 1975