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Śrī Caitanya-caritāmṛta
[Madhya-līlā, Ch. 20]
simultaneously one with and different from Lord Kṛṣṇa, is still the incarnation of the mode of darkness. However, Lord Viṣṇu is Kṛṣṇa's personal expansion; therefore He is the director of the mode of goodness and is always transcendentally situated beyond the jurisdiction of the modes of material nature. Lord Viṣṇu is the original personal expansion of Kṛṣṇa, and Kṛṣṇa is the original source of all incarnations. As far as power is concerned, Lord Viṣṇu is as powerful as Lord Kṛṣṇa because He possesses all the opulences.
TEXT 316
দীপাচিরেব হি দশান্তরমভ্যুপেত্য 
    দীপায়তে বিবৃতহেতুসমানধর্ম।। 
    যস্তাদৃগেব হি চ বিষ্ণুতয়া বিভাতি 
    গোবিন্দমাদিপুরুষং তমহং ভজামি ॥ ৩১৬ ॥
dīpārcir eva hi daśāntaram abhyupetya 
    dīpāyate vivṛta-hetu-samāna-dharmā 
    yas tādṛg eva hi ca viṣṇutayā vibhāti 
    govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
SYNONYMS
dīpa-arciḥ —the flame of a lamp;  eva —as;  hi —certainly;  daśā-antaram —another lamp;  abhyupetya —expanding;  dīpāyate —illuminates;  vivṛta-hetu —with its expanded cause;  samāna-dharmā —equally powerful;  yaḥ —who;  tādṛk —similarly;  eva —certainly;  hi —certainly;  ca —also;  viṣṇutayā —by His expansion as Lord Viṣṇu;  vibhāti —illuminates;  govindam —to Lord Kṛṣṇa;  ādi-puruṣam —the supreme original person;  tam —to Him;  aham —I;  bhajāmi —offer my worshipful respect.
TRANSLATION
“When the flame of one candle is expanded to another candle and placed in a different position, it burns separately, and its illumination is as powerful as the original candle. Similarly, the Supreme Personality of Godhead, Govinda, expands Himself in different forms as Viṣṇu, who is equally luminous, powerful and opulent. Let me worship that Supreme Personality of Godhead, Govinda.’
PURPORT
This is a quotation from  Brahma-saṁhitā  (5.46).