CC Ādi 4.55
ekātmānāv api bhuvi purā deha-bhedaṁ gatau tau
caitanyākhyaṁ prakaṭam adhunā tad-dvayaṁ caikyam āptaṁ
rādhā-bhāva-dyuti-suvalitaṁ naumi kṛṣṇa-svarūpam
rādhā — Śrīmatī Rādhārāṇī; kṛṣṇa — of Lord Kṛṣṇa; praṇaya — of love; vikṛtiḥ — the transformation; hlādinī śaktiḥ — pleasure potency; asmāt — from this; eka-ātmānau — both the same in identity; api — although; bhuvi — on earth; purā — from beginningless time; deha-bhedam — separate forms; gatau — obtained; tau — these two; caitanya-ākhyam — known as Śrī Caitanya; prakaṭam — manifest; adhunā — now; tat-dvayam — the two of Them; ca — and; aikyam — unity; āptam — obtained; rādhā — of Śrīmatī Rādhārāṇī; bhāva — mood; dyuti — the luster; suvalitam — who is adorned with; naumi — I offer my obeisances; kṛṣṇa-svarūpam — to Him who is identical with Śrī Kṛṣṇa.
“The loving affairs of Śrī Rādhā and Kṛṣṇa are transcendental manifestations of the Lord’s internal pleasure-giving potency. Although Rādhā and Kṛṣṇa are one in Their identity, They separated Themselves eternally. Now these two transcendental identities have again united, in the form of Śrī Kṛṣṇa Caitanya. I bow down to Him, who has manifested Himself with the sentiment and complexion of Śrīmatī Rādhārāṇī although He is Kṛṣṇa Himself.”
This text is from the diary of Śrīla Svarūpa Dāmodara Gosvāmī. It appears as the fifth of the first fourteen verses of Śrī Caitanya-caritāmṛta.