In the Vayu Purana, the Lord tells Brahma: "Lord Balarama, who is My first expansion and non-different from Me will also appear by My side as Lord Shri Nityananda. He will become the crest jewel of all renunciants on the earth."
"Assuming the dress of an avadhuta, He will freely distribute bhagavata dharma i.e. love of God. He will distribute this pure love through various means and deliver all the living entities. He will do so first as a brahmacari and later as a householder."
"Accompanied by His eternal consort Shrimati Jahnavi-devi and many other intimate associates, He (Nityananda) will reveal His transcendental pastimes to the people."
Ananta-Samhita of Atharva Veda
nityanando maha-kayo, bhutva mat-kirtane ratah; vimudhan bhakti-rahitan, mama bhaktan karisyasi.
In the Ananta-Samhita, the Lord states to Anantadeva: "When I appear in Navadvipa in Kali-yuga, You will become Nityananda. You will have a very tall, beautiful and large body, and You will be constantly absorbed in chanting My name and glories. In this way, by Your causeless mercy You will convert many bewildered fools who are devoid of devotion into My pure unalloyed devotees."
Shri Chaitanya-Charitamrita, Adi 1.7-11
sankarshanah karana-toya-sayi garbhoda-sayi ca payobdhi-sayi seshas ca yasyamsa-kalah sa nitya- nandakhya-ramah saranam mamastu
May Shri Nityananda Prabhu be the object of my constant remembrance. Sankarshana, Mahavishnu, Garbhodakshayi Vishnu, and Kshirodakshayi Vishnu, as well as Sesha are His expansions and the expansions of His expansions. That same Nityananda Prabhu, is none other than Balarama. (Cc. Adi 1.7)
mayatite vyapi-vaikuntha-loke purnaisvarye shri-catur-vyuha-madhye rupam yasyodbhati sankarshanakhyam tam shri-nityananda-ramam prapadye
I surrender unto the lotus feet of Shri Nityananda Rama, who is known as Saokarshana in the midst of the catur-vyuha. He has full opulences and resides in Vaikunthaloka far beyond the material creation. (Cc. Adi 1.8)
maya-bhartajanda-sanghasrayangah sete sakshat karanambhodhi-madhye yasyaikamsah shri-puman adi-devas tam shri-nityananda-ramam prapadye
I offer my full obeisances unto the feet of Shri Nityananda Rama, whose partial representation called Karanodakasayi Vishnu, lying on the Karana ocean, is the original Purusha, the master of the illusory energy and the shelter of all the universes. (Cc. Adi 1.9)
yasyamsamsah shrila-garbhoda-sayi yan-nabhy-abjam loka-sanghata-nalam loka-srashtuh sutika-dhama dhatus tam shri-nityananda-ramam prapadye
I offer my full obeisances unto the feet of Shri Nityananda Rama, a partial part of whom is Garbhodakshayi Vishnu. From the navel of Garbhodakshayi Vishnu sprouts the lotus stem that is the birthplace of Brahma, the engineer of the Universe. The stem of that lotus is the resting place of the multitude of planets. (Cc. Adi 1.10)
yasyamsamsamsah paratmakhilanam poshta vishnur bhati dugdhabdhi-sayi kshauni-bharta yat-kala so 'py anantas tam shri-nityananda-ramam prapadye
I offer my full obeisances unto the feet of Shri Nityananda Rama, whose secondary part is the Vishnu lying in the ocean of milk. That Kshirodakashayi Vishnu is the Supersoul of all living entities and the maintainer of all the universe. Sesha Naga is His further sub-part. (Cc. Adi 1.11)
Lord Nityananda Baladeva is the Original Sankarshana
5.7 shri-balarama gosani mula-sankarshana panca-rupa dhari' karena krishnera sevana apane karena krishna-lilara sahaya shrishti-lila-karya kare dhari' cari kaya
Lord Balarama is the original Sankarshana. He assumes five other forms to serve Lord Krishna. He helps in the pastimes of Lord Krishna, and He does the work of creation in four other forms. (Cc. Adi 5.8,9)
Balarama and Nityananda are non Different
5.8 prema-pracarana ara pashanda-dalana dui-karye avadhuta karena bhramana
For two purposes to spread the cult of bhakti and to defeat and subdue the atheists Lord Nityananda, the most dedicated devotee of the Lord, moved throughout the country. (Cc. Antya 3.149)
[All glories to Nityananda Prabhu!] Maddened by ecstatic love of Godhead, he overwhelmed the universe with ecstasy. He slapped his hands together like a warrior who is about to attack, and upon seeing this, the wicked Kali fled in terror, fearing for his life. All souls were drowned in happiness because of the dancing of Shri Gauranga [and Nityananda]. Seeing such dancing, or even hearing of it, melts the hearts even of great atheists. (Gitavali, Nagara-kirtana, 8)
All glory, all glory to Lord Nityananda Balarama, by whose mercy I have attained shelter in the transcendental abode of Vrindavana. All glory, all glory to the merciful Lord Nityananda, by whose mercy I have attained shelter of Shri Rupa and Sanatana. By His mercy, I have attained the shelter of the great Shri Raghunatha dasa Gosvami, and by His mercy I have found the refuge of Shri Svarupa Damodara. By the mercy of Sanatana Gosvami I have learned the final conclusions of devotional service, and by the grace of Shri Rupa Gosvami I have tasted the highest nectar of devotional service. All glory, all glory to the lotus feet of Lord Nityananda, by whose mercy I have attained Shri Radha-Govinda. (Cc. Adi. 5.200-204)
Nityananda is the Savior of the Most Fallen
5.11 jagai madhai haite muni se papishtha purishera kita haite muni se laghishtha mora nama sune yei tara punya kshaya mora nama laya yei tara papa haya emana nirghrina more keba kripa kare eka nityananda vinu jagat bhitare preme matta nityananda kripa-avatara uttama, adhama, kichu na kare vicara ye age padaye, tare karaye nistara ataeva nistarila mo-hena duracara
I am more sinful than Jagai and Madhai and even lower than the worms in stool. Anyone who hears my name loses the results of his pious activities. Whoever utters my name becomes sinful. Who in this world but Nityananda could show His mercy to such an abominable person as me? Because He is intoxicated by ecstatic love and is an incarnation of mercy, He does not distinguish between the good and the bad. He delivers all those who fall down before Him. Therefore He has delivered such a sinful and fallen person as me. (Cc. Adi 5.205-209)
Freedom from Anarthas and the Desire for Bhakti is Strengthened by the Mercy of Nitai
5.12 samsarera para hai' bhaktira sagare ye dubibe se bhajuk nitai-candere
One who would cross over the ocean of material existence and swim in the bhakti ocean should worship the lotus feet of Nityananda. (Cb. Adi 1.77)
Nityananda is the Foremost Preacher
5.13 caitanyera adi-bhakta nityananda-raya caitanyera yaso vaise yanhara jihvaya aharnisa caitanyera katha prabhu kaya tan're bhajile se caitanye bhakti haya
Lord Chaitanya's first and foremost devotee is Nityananda Raya. The glories of Lord Chaitanya are always on his tongue. Day and night Lord Nityananda speaks only of Lord Chaitanya. Whoever worships Him is a real devotee of Shri Chaitanya. (Cb. Adi 9.217-218)
Nityananda, the wandering mendicant, is the foremost of all the servants of Lord Chaitanya. He is like the gateway through which all service to Lord Chaitanya must pass. He became mad in the ecstasy of service to Lord Chaitanya. (Cc. Adi 6.48)
Those who Have no Faith that Gaura and Nitai are Inseparable are Offenders and Atheists
5.15 dui bhai eka-tanu samana-prakasa nityananda na mana, tomara habe sarva-nasa ekete visvasa, anye na kara sammana "ardha-kukkuti-nyaya" tomara pramana
These two brothers (Gaura and Nitai) are like one body; they are identical manifestations. If you do not believe in Lord Nityananda, you will fall down. If you have faith in one, but disrespect the other, your logic is like the logic of accepting half a hen. (Cc. Adi 5.175,176)
Faith in Gaura Without Nitai, or Nitai Without Gaura, is Flickering Faith and in Opposition to Pure Devotional Service
5.16 kimva, dooha na manina hao ta' pashanda eke mani' are na mani, ei-mata bhanda
It would be better to be an atheist by slighting both brothers than a hypocrite by believing in one and slighting the other. (Cc. Adi 5.177)
Thus ends the Fifth Jewel of Gaudiya Kanthahara, entitled Nityananda-tattva compiled by Shrila Bhaktisiddhanta Sarasvati Thakura Prabhupada.