ye bhakti gopikā-gaṇer kabe bhāgavate
nityānanda hoite tāhā pāila jagate
“The love for Krsna in the mood of the Gopis which is described in the Bhagavata is attained in this world through Nityananda.”
(Caitanya Bhagavata - 3.5.303)
"Vaidhī-Bhakti, isto é aprendizagem. Bhakti verdadeira, Parā-Bhakti, é Rāgānugā-Bhakti." (Śrīla Prabhupāda)