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CC Antya 9.151

caitanya-caritra ei parama gambhīra
sei bujhe, tāṅra pade yāṅra mana ‘dhīra’
caitanya-caritra — behavior of Lord Caitanya; ei — this; parama gambhīra — very grave; sei bujhe — he understands; tāṅra pade — upon His lotus feet; yāṅra — whose; mana — mind; dhīra — sober.
The intentions of Śrī Caitanya Mahāprabhu are so deep that one can understand them only if he has complete faith in service to the lotus feet of the Lord.