CC Ādi 6.108

svā-mādhurya āsvādite karena yatana
bhakta-bhāva vinu nahe tāhā āsvādana
Synonyms: 
svā-mādhurya — the sweetness of Himself; āsvādite — to taste; karena yatana — makes endeavors; bhakta-bhāva — the emotion of being a devotee; vinu — without; nahe — there is not; tāhā — that; āsvādana — tasting.
Translation: 
He tries to taste His own sweetness, but He cannot do so without accepting the emotions of a devotee.
Purport: 

Lord Śrī Kṛṣṇa wanted to relish the transcendental mellow of a devotee, and therefore He accepted the role of a devotee by appearing as Śrī Kṛṣṇa Caitanya Mahāprabhu.