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.
I do not want to get material life, do not want the sense-life, but something higher. That is renunciation. Then, by the power of meditation, undo the mischief that has been done.
-Swami Vivekananda