Nitai is an eternal servant of Lord Caitanya. Nitai controls Gaur with His love. Nitai is the personification of pure devotional service. He is nothing but bhakti. He only desires to fulfill the desires of Lord Caitanya. All desires of Lord Chaitanya are fulfilled by Him.
CC Ādi 5.156
śrī-caitanya — sei kṛṣṇa, nityānanda — rāma
nityānanda pūrṇa kare caitanyera kāma
“Lord Caitanya is the same Lord Kṛṣṇa, and Lord Nityānanda is Lord Balarāma. Lord Nityānanda fulfills all of Lord Caitanya’s desires.”
Nitai has the greatest privilege of serving Lord Caitanya in all possible devotional mellows. He is non-different from Balaram. He is indeed the Supreme Personality of Servitor Godhead. He constantly tastes the highest ecstasies of devotional service and thus He is known as Nityananda. He is truly much more merciful upon the fallen souls than Gaur. As He is Servitor Godhead, He knows the bliss of serving the Supreme Lord Gaur Krishna. Gaur-Krishna does not completely understand the bliss that a devotee feels when He serves the Lord.
Lord Krishna says,
viṣaya-jātīya sukha āmāra āsvāda
āmā haite koṭi-guṇa āśrayera āhlāda
āśraya-jātiya sukha pāite mana dhāya
yatne āsvādite nāri, ki kari upāya
“I taste the bliss to which the object of love is entitled. But the pleasure of Rādhā, the abode of that love, is ten million times greater. My mind races to taste the pleasure experienced by the abode, but I cannot taste it, even by My best efforts. How may I taste it? (CC Ādi 4.133-134)
In fact, āśraya-jātiya sukha is experienced by all the pure devotees of the Lord in different degrees as they all are ashrita (sheltered) at the Lotus Feet of Gaur-Krishna.
Gaur-Krishna is the Supreme enjoyer and His associates are always increasing His enjoyment. However, His associates experience more enjoyment in giving enjoyment to Gaur-Krishna than Gaur-Krishna Himself. This is difficult to comprehend but this only the main reason why Krishna adopted the mood and complexion of Shrimati Radharani and became Gaurhari.
CC Ādi 4.126
nija-premāsvāde mora haya ye āhlāda
tāhā ha’te koṭi-guṇa rādhā-premāsvāda
“Whatever pleasure I get from tasting My love for Śrīmatī Rādhārāṇī, She tastes ten million times more than Me by Her love.
Since, the devotees know the bliss of serving Gaur-Krishna they are always more eager to engage the fallen souls in the devotional service of the Lord than Gaur-Krishna. And who is a greater devotee of Gaur-Krishna than Nitai! Yes, Krishna tells Arjun, during the conversation of Bhagwad Gita, that you should surrender unto me and become my devotee but He does not go from door to door begging everyone to serve Him. It is Nitai who does it because Nitai is the Topmost Servant of Gaur. Nitai really knows how important bhakti is for the living entities. Nitai has full experience of the bliss that one receives as a side effect of devotional service (sandranand visheshatma). Thus, He is supremely eager to award bhakti to one and all.
Sevya Bhagwan (Gaur-Krishna) knows that devotional service is ‘good’ for the living entities, but how ‘good’ is it, that is only known to Sevak Bhagwan (Nitai-Balaram) as He has highest first hand experience of that ‘goodness’. Thus, Nitai’s eagerness to award us bhakti is unimaginably much more than the eagerness of Gaur-Krishna to give us bhakti.
P. S. : In fact, the meanings of the 10 syllables of the निताइ mantra indicate this eagerness only. Nitai approaches the fallen souls from door to door and awards them His protective shelter. Then He removes all anarthas one by one with his plow and club and, finally, how He awards one pure love of Godhead (Prayojan). From the very first syllable to the last of निताइ Nam Akshar Parabrahm, Nitai’s extreme eagerness to uplift a fallen soul, from the lowest position to the highest position, is reflected.
Worthless disciple of Shrila Nitaipreshthji,