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Teachings of Lord Chaitanya
Maya, has many Forms; generally, they are numbered at eleven. Lord Shiva is not one of the living entities—he is more-or-less Krishna Himself. The example is given of the distinction between milk and yogurt. Yogurt is a preparation of milk, but still yogurt cannot be used as milk. Similarly, Lord Shiva is an expansion of Krishna, but he cannot act as Krishna, nor can we derive the spiritual restoration from Lord Shiva that we can derive from Krishna. The essential difference is that Lord Shiva has a connection with the material Nature, but Vishnu has nothing to do with the material Nature. In  Srimad Bhagwatam , Tenth Canto, Eighteenth Chapter, it is said that Lord Shiva is a combination of the three kinds of transformed consciousness, known as  Baikrik ,  Taijsa  and  Tamasa .
The Vishnu incarnation, although Master of the modes of goodness within each Universe, is in no way in touch with the influence of material Nature. Everything of Vishnu is equal to Krishna, but still Krishna is the original Source. Vishnu is partial, and Krishna is whole. This is the version of the Vedic literature. In the  Brahma Samhita  there is the example of an original lamp which lights a second lamp; although both the lamps are of equal candle power, still one is accepted as the original, and the other is said to be kindled by the original lamp. The Vishnu expansion is like that. He is Vishnu, He is equally powerful, but the original Vishnu is Krishna. Brahma and Lord Shiva are obedient servants of the Supreme Lord and the Supreme Lord as Vishnu is an expansion of Krishna.
After describing the Leela Avatara and Guna Avatara, Lord Chaitanya then explained to Sanatan Goswami about the  Manvantara Avatara . He states that there is no counting of the  Manvantara Avatara . The Manus are fourteen in one  Kalpa , or one day of Brahma. One day of Brahma is calculated at 432 million years, and during that period of time there are fourteen Manus. Brahma lives for 100 years on this scale. Therefore, during the lifetime of Brahma, if fourteen Manus appear in one day, then there are 420 Manus during the month of Brahma, and during the year of Brahma there are 5,040 Manus. Brahma lives for 100 years, and it is calculated that there are five hundred four thousand Manus in one Brahma's duration of life. There are innumerable Universes, and one can just imagine how many Manvantara incarnations there are in the total.
The Universes are being produced by the breathing out of Maha Vishnu, and no one can calculate how many Manus there are at one time. Each Manu is called by a different name. The first Manu is called Svayambhuba. He is the son of Brahma personally. The second Manu is called Swarochis; he is the son of the predominating deity of fire. The third Manu is called Uttam; and