Since their (Lord Caitanya and Venkata Bhatta's) conversation took place long, long before the Bhakti-rasamrta-sindhu was composed, the question may be raised as to how either of them quoted the verse

Expressions researched:
"since their conversation took place long, long before the Bhakti-rasāmṛta-sindhu was composed, the question may be raised as to how either of them quoted the verse"

Sri Caitanya-caritamrta

CC Madhya-lila

This is a verse from the Bhakti-rasāmṛta-sindhu (1.2.59). Here Śrīla Kṛṣṇadāsa Kavirāja says that Lord Caitanya spoke the verse to Veṅkaṭa Bhaṭṭa, and earlier he said that Veṅkaṭa Bhaṭṭa spoke it to the Lord. But since their conversation took place long, long before the Bhakti-rasāmṛta-sindhu was composed, the question may be raised as to how either of them quoted the verse. Śrīla Bhaktivinoda Ṭhākura explains that this verse and many others like it were current among devotees long before the Bhakti-rasāmṛta-sindhu was composed.

CC Madhya 9.146, Translation and Purport

“‘According to transcendental realization, there is no difference between the forms of Kṛṣṇa and Nārāyaṇa. Yet in Kṛṣṇa there is a special transcendental attraction due to the conjugal mellow, and consequently He surpasses Nārāyaṇa. This is the conclusion of transcendental mellows.’

This is a verse from the Bhakti-rasāmṛta-sindhu (1.2.59). Here Śrīla Kṛṣṇadāsa Kavirāja says that Lord Caitanya spoke the verse to Veṅkaṭa Bhaṭṭa, and earlier he said that Veṅkaṭa Bhaṭṭa spoke it to the Lord. But since their conversation took place long, long before the Bhakti-rasāmṛta-sindhu was composed, the question may be raised as to how either of them quoted the verse. Śrīla Bhaktivinoda Ṭhākura explains that this verse and many others like it were current among devotees long before the Bhakti-rasāmṛta-sindhu was composed. Thus devotees would always quote them and explain their purport in ecstasy.