(Advaita Acharya offering prayers, tulasi leaves and Ganges water to His salagrama-sila)
"The Supreme Personality of Godhead, Lord Śrī Kṛṣṇa, after displaying His pastimes as Lord Kṛṣṇa, thought it wise to make His advent in the form of a devotee to explain personally the transcendental mellows of reciprocal service and love exchanged between Himself and His servants, friends, parents and fiancées. According to the Vedic literature, the foremost occupational duty for humanity in this Age of Kali is nāma-saṅkīrtana, or congregational chanting of the holy name of the Lord. The incarnation for this age especially preaches this process, but only Kṛṣṇa Himself can explain the confidential loving service performed in the four principal varieties of loving affairs between the Supreme Lord and His devotees. Lord Kṛṣṇa therefore personally appeared, with His plenary portions, as Lord Caitanya. As stated in this chapter, it was for this purpose that Lord Kṛṣṇa appeared personally in Navadvīpa in the form of Śrī Kṛṣṇa Caitanya Mahāprabhu.
Kṛṣṇadāsa Kavirāja has herein presented much authentic evidence from Śrīmad-Bhāgavatam and other scriptures to substantiate the identity of Lord Caitanya with Śrī Kṛṣṇa Himself. He has described bodily symptoms in Lord Caitanya that are visible only in the person of the Supreme Lord, and he has proved that Lord Caitanya appeared with His personal associates—Śrī Nityānanda, Advaita, Gadādhara, Śrīvāsa and other devotees—to preach the special significance of chanting Hare Kṛṣṇa. The appearance of Lord Caitanya is both significant and confidential. He can be appreciated only by pure devotees and only through the process of devotional service. The Lord tried to conceal His identity as the Supreme Personality of Godhead by representing Himself as a devotee, but His pure devotees could recognize Him by His special features. The Vedas and Purāṇas foretell the appearance of Lord Caitanya, but still He is sometimes called, significantly, the concealed descent of the Supreme Personality of Godhead.
Advaita Ācārya was a contemporary of Lord Caitanya’s father. He felt sorry for the condition of the world because even after Lord Kṛṣṇa’s appearance, no one had interest in devotional service to Kṛṣṇa. This forgetfulness was so overwhelming that Advaita Prabhu was convinced that no one but Lord Kṛṣṇa Himself could enlighten people about devotional service to the Supreme Lord. Therefore Advaita requested Lord Kṛṣṇa to appear as Lord Caitanya. Offering tulasī leaves and Ganges water, He cried for the Lord’s appearance. The Lord, being satisfied by His pure devotees, descends to satisfy them. As such, being pleased by Advaita Ācārya, Lord Caitanya appeared."
(Caitanya-caritāmṛta Ādi 3, Summary)