In Siksastakam, Caitanya Mahaprabhu reveals the depth of His devotional emotions. though He is the supereme Lord himself, He descended in the mood of a devotee to teach us the path of pure bhakti.
Since people in general are very fallen in Kaliyuga, the Lord also manifests extraordinary mercy to deliver them. This most merciful form of the Lord is Sri Caitanya Mahaprabhu.
Kaliyuga is extremely special. Kaliyuga in which Sri Krsna appears with Radharani as Caitanya Mahāprabhu happens once in one day of Brahma – śrī-kṛṣṇa-caitanya rādhā-kṛṣṇa nahe anya.
Krishna is merciful but Lord Caitanya is Mahavadanyay, that is, the most merciful. We are the most fallen ones; therefore we should seek Mahaprabhu’s mercy.