prabhu kahe, — "ye karite karibā tumi mana
kṛṣṇa sei sei tomā karābe sphuraṇa
prabhu kahe - Śrī Caitanya Mahāprabhu said; ye - whatever; karite - to do; karibā tumi mana - you want; kṛṣṇa - Lord Kṛṣṇa; sei sei - that; tomā - to you; karābe sphuraṇa - will manifest.
Sanātana Gosvāmī was a pure devotee of Kṛṣṇa. A pure devotee has no business other than serving Kṛṣṇa; consequently Kṛṣṇa is always ready to help him. This benediction was given by Śrī Caitanya Mahāprabhu to Sanātana Gosvāmī, who was authorized to write Vaiṣṇava smṛti. Sanātana Gosvāmī was a pure devotee of the Lord, and through the blessings of Śrī Caitanya Mahāprabhu he was able to write the book perfectly.