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CC Ādi 7.11

kṛṣṇa-mādhuryera eka adbhuta svabhāva
āpanā āsvādite kṛṣṇa kare bhakta-bhāva
Synonyms: 
kṛṣṇa-mādhuryera — the supreme pleasure potency of Kṛṣṇa; eka — is one; adbhuta — wonderful; svabhāva — nature; āpanā — Himself; āsvādite — to taste; kṛṣṇa — the Supreme Personality of Godhead; kare — does; bhakta-bhāva — accept the form of a devotee.
Translation: 
The transcendental mellow of conjugal love of Kṛṣṇa is so wonderful that Kṛṣṇa Himself accepts the form of a devotee to relish and taste it fully.
Purport: 

Although Kṛṣṇa is the reservoir of all pleasure, He has a special intention to taste Himself by accepting the form of a devotee. It is to be concluded that although Lord Caitanya is present in the form of a devotee, He is Kṛṣṇa Himself. Therefore Vaiṣṇavas sing, śrī-kṛṣṇa-caitanya rādhā-kṛṣṇa nahe anya: “Rādhā and Kṛṣṇa combined together are Śrī Kṛṣṇa Caitanya Mahāprabhu.” And as Śrī Svarūpa Dāmodara Gosvāmī has said, caitanyākhyaṁ prakaṭam adhunā tad-dvayaṁ caikyam āptam: Rādhā and Kṛṣṇa assumed oneness in the form of Śrī Caitanya Mahāprabhu.