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.
This world is nothing. It is at best only a hideous caricature, a shadow of the Reality. We must go to the Reality. Renunciation will take us to It.
-Swami Vivekananda