bhakta-bhāva aṅgīkari' hailā avatīrṇa
śrī-kṛṣṇa-caitanya-rūpe sarva-bhāve pūrṇa
bhakta-bhāva—the ecstasy of being a devotee; aṅgīkari'-accepting; hailā—became; avatīrṇa—incarnated; śri-kṛṣṇa-caitanya-rūpe—in the form of Lord Śrī Kṛṣṇa Caitanya; sarva-bhāve pūrṇa—complete in every respect.
Therefore Lord Kṛṣṇa accepted the position of a devotee and descended in the form of Lord Caitanya, who is complete in every respect.
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