Locana Dasa Thakura declares that the two Lords Nitai-Gauracandra Lord Nitai and Lord Caitanya are very merciful. They are the essence of all incarnations. The specific significance of these incarnations is that prosecuting Their way of self-realization is simply joyful, for They introduced chanting and dancing. There are many incarnations, like Lord Rama and even Krsna, who taught Bhagavad-gita, which requires knowledge and understanding. But Lord Caitanya and Nityananda introduced a process that is simply joyful simply chant and dance.

His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Sri Sri Gaura-Nityanander Daya, Purport

Lord Krsna has mercifully manifest His transcendental feature of Lord Sri Caitanya Mahaprabhu and the Panca-tattva for the highest benefit of humanity. These direct manifestations of transcendence are immediate expansions of the internal spiritual potency of the Lord.

Haridasa Thakura
Sri Harinama Cintamani

The pastimes of Lord Krsna are the essence of all nectar, and that nectar is flowing in hundreds of rivers in all directions. The pastimes of Sri Caitanya Mahaprabhu are an eternal reservoir, and one is advised to let his mind swim like a swan on this transcendental lake.

Srila Krsnadasa Kaviraja Gosvami
Caitanya-caritamrta, Madhya-lila 25.271

If one only chants, with some slight faith, the holy names of Lord Caitanya and Nityananda, very quickly he is cleansed of all offenses. Thus as soon aws he chants the Hare Krsna maha-mantra, he feels the ecstasy of love for God.

Srila Krsnadasa Kaviraja Gosvami
Caitanya-caritamrta, Adi-lila 8.31

He is like a golden mountain that scatters jewels of pure love of God. Because of His great mercy, He wandered this earth planet. That Lord known as Visvambhara, the maintainer of the universe, inundated His own universe with the currents of the Ganges River of the tears of love of Godhead flowing from His eyes. All glories to that Lord, the son of Sacidevi.

Srila Visvanatha Cakravarti Thakura
Sri Sacinandana-vijayastka (7)

I offer obeisances to the most magnanimous giver of love of Krsna, Krsna Himself bearing the name Krsna Caitanya, who possesses a form of golden hue. I submit myself to the merciful person Sri Krsna Caitanya, who performed wonderful deeds. With the nectarean treasure of His own love, He intoxicated the world (delirious with ignorance) by freeing it from the malady of nescience.

Srila Bhaktisiddhanta Sarasvati Thakura
Hari-bhakti-kalpa-latika, Foreword