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Śrī Caitanya-caritāmṛta
sarva-avatārī kṛṣṇa svayaṁ bhagavān tāṅhāra dvitīya deha śrī-balarāma
SYNONYMS
sarva-avatārī —the source of all incarnations;  kṛṣṇa —Lord Kṛṣṇa;  svayam —personally;  bhagavān —the Supreme Personality of Godhead;  tāṅhāra —His;  dvitīya —second;  deha —expansion of the body;  śrī-balarāma —Lord Balarāma.
TRANSLATION:
The Supreme Personality of Godhead, Kṛṣṇa, is the fountainhead of all incarnations. Lord Balarāma is His second body.
PURPORT
Lord Śrī Kṛṣṇa, the absolute Personality of Godhead, is the primeval Lord, the original form of Godhead, and His first expansion is Śrī Balarāma. The Personality of Godhead can expand Himself in innumerable forms. The forms that have unlimited potency are called  svāṁśa , and forms that have limited potencies (the living entities) are called  vibhinnāṁśa .
TEXT 5
একই স্বরূপ দোঁহে, ভিন্নমাত্র কায় ।
আত্ম কায়ব্যুহ, কৃষ্ণলীলার সহায় ॥ ৫ ॥
eka-i svarūpa doṅhe, bhinna-mātra kāya ādya kāya-vyūha, kṛṣṇa-līlāra sahāya
SYNONYMS
eka-i —one;  svarūpa —identity;  doṅhe —both of Them;  bhinna-mātra kāya —only two different bodies;  ādya —original;  kāya-vyūha —quadruple expansions;  kṛṣṇa-līlāra —in the pastimes of Lord Kṛṣṇa;  sahāya —assistance.
TRANSLATION
They are both one and the same identity. They differ only in form. He is the first bodily expansion of Kṛṣṇa, and He assists in Lord Kṛṣṇa's transcendental pastimes.
PURPORT
Balarāma is a  svāṁśa  expansion of the Lord, and therefore there is no difference in potency between Kṛṣṇa and Balarāma. The only difference is in Their bodily structure. As the first expansion of Godhead, Balarāma is the chief Deity among the first quadruple forms, and He is the foremost assistant of Śrī Kṛṣṇa in His transcendental activities.