Śrī Caitanya Mahāprabhu is the mercy incarnation of the Supreme Personality of Godhead. He is addressed by Śrīla Rūpa Gosvāmī as mahā-vadānyāvatāra, or the most magnanimous incarnation. Śrīla Rūpa Gosvāmī also says, karuṇayāvatīrṇaḥ kalau: it is only by His mercy that He has descended in this Age of Kali. Here this is exemplified. Śrī Caitanya Mahāprabhu did not like to see Māyāvādī sannyāsīs because He thought of them as offenders to the lotus feet of Kṛṣṇa, but here He excuses them (tāṅ-sabāra kṣami' aparādha).
(Sri Caitanya Caritamrta------1:7:150-------purport).

The fruits of the tree of devotional service were innumerable, and therefore He wanted to distribute them unrestrictedly to everyone. Śrīla Rūpa Gosvāmī therefore writes:
anarpita-carīṁ cirāt karuṇayāvatīrṇaḥ kalau
samarpayitum unnatojjvala-rasāṁ sva-bhakti-śriyam
hariḥ puraṭa-sundara-dyuti-kadamba-sandīpitaḥ
sadā hṛdaya-kandare sphuratu vaḥ śacī-nandanaḥ
There were many previous incarnations of the Supreme Personality of Godhead, but none were so generous, kind and magnanimous as Śrī Caitanya Mahāprabhu, for He distributed the most confidential aspect of devotional service, namely, the conjugal love of Rādhā and Kṛṣṇa.

(Sri Caitanya Caritamrta------1:9:37-------purport).

"May the Supreme Lord who is known as the son of Śrīmatī Śacīdevī be transcendentally situated in the innermost core of your heart. Resplendent with the radiance of molten gold, He has descended in the Age of Kali by His causeless mercy to bestow what no incarnation has ever offered before: the most elevated mellow of devotional service, the mellow of conjugal love.""
This verse (Vidagdha-mādhava 1.2) also appears in the Ādi-līlā (1.4 and 3.4). In his commentary on the Vidagdha-mādhava, Śrīla Viśvanātha Cakravartī Ṭhākura remarks, mahā-prabhoḥ sphūrtiṁ vinā hari-līlā-rasāsvādanānupapatter iti bhāvaḥ: "Without the mercy of Śrī Caitanya Mahāprabhu, one cannot describe the pastimes of the Supreme Personality of Godhead." Therefore Śrīla Rūpa Gosvāmī said, vo yuṣmākaṁ hṛdaya-rūpa-guhāyāṁ śacī-nandano hariḥ pakṣe siṁhaḥ sphuratu: “May Śrī Caitanya Mahāprabhu, who is exactly like a lion that kills all the elephants of desire, be awakened within everyone's heart, for by His merciful blessings one can understand the transcendental pastimes of Kṛṣṇa.”

(Sri Caitanya Caritamrta------3:1:132-------translation and purport).