caitanya-caritra ei parama gambhira
sei bujhe' tanra pade yanra mana 'dhira'
caitanya-caritra—behavior of Lord Caitanya; ei—this; parama gambhira—very grave; sei bujhe—he understands; tanra pade—upon His lotus feet; yanra—whose; mana—mind; dhira—sober.
The intentions of Sri Caitanya Mahaprabhu are so deep that one can understand them only if he has complete faith in service to the lotus feet of the Lord.
Link to this page: https://prabhupadabooks.com/cc/antya/9/151