Sri Chaitanya Mahaprabhu showed by his personal life the validity of the doctrines of devotion described in Srimad Bhagavata. Holding Achintya-Bheda-bheda or identity-in-difference to be the nature of the Ultimate Reality whom he called Sri Krishna, Chaitanya demonstrated how Bhakti is the sure way to higher spiritual development.
Jnana teaches that the world should be given up, but not on that account to be abandoned. To be in the world but not of it -- is the true test of the sannyasin.
-Swami Vivekananda