CC Antya 20.8

harṣe prabhu kahena, — “śuna svarūpa-rāma-rāya
nāma-saṅkīrtana — kalau parama upāya
Word for word: 
harṣe — in jubilation; prabhu — Śrī Caitanya Mahāprabhu; kahena — says; śuna — please hear; svarūpa-rāma-rāya — My dear Svarūpa Dāmodara Gosvāmī and Rāmānanda Rāya; nāma-saṅkīrtana — chanting of the holy name of the Lord; kalau — in the Age of Kali; parama upāya — the most feasible means for deliverance.
Translation: 
In great jubilation, Śrī Caitanya Mahāprabhu said, “My dear Svarūpa Dāmodara and Rāmānanda Rāya, know from Me that chanting the holy names is the most feasible means of salvation in this Age of Kali.