Saura Purana

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Rama Agastya Hanuman Veda

An incident about the meeting of the four Kumaras with Vishnu's avatar Rama is narrated in the Uttarakanda of the Ramcharitmanas. 

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The Kumaras once stayed in the hermitage of the sage Agastya, who told them about the glory of Rama. 

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So to meet Rama, they went to a forest grove where Rama with his brothers and disciple Hanuman had come.

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 Rama and his brothers were so pleased with meeting the four enlightened sages that they paid obeisance to them. The sages were wonderstruck looking at the divinity of Rama that they prostrated before him and out of great ecstasy started shedding tears of happiness. Rama looking at the sages was deeply impressed and asked them to be seated and praised them for their great achievements and their erudite knowledge of the Vedas and Puranas. The four Kumaras were also delighted to hear the words of praise showered on them by Rama. They in turn extolled his great virtues in a hymn.

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Four Kumaras preaching in the Mahabharata

The Shanti Parva book of the Mahabharata describes the discourse given by the four Kumaras to the demon king Vritra and his guru – the sage Shukra. 

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The king and his guru worship the Kumaras and then Shukra asks them to describe the greatness of Vishnu. Sanat-kumara starts with describing Vishnu as the creator and destroyer of all beings. He equates Vishnu's body parts with parts of the universe and the elements, for example the earth is Vishnu's feet and water is his tongue. All gods are describes as being Vishnu. 

Then Sanatkumara categories all beings into six colours depending upon the proportion of the three gunas:

1. Sattva (pure), 
2. Rajas (dim) and 
3. Tamas (dark). 

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From the lowest to the foremost beings, the colours are 

1. dark (Tamas is high, Rajas is mid, Sattva is low), 
2. tawny (Tamas is high, Sattva is mid, Rajas is low), 
3. blue (Rajas is high, Tamas is mid, Sattva is low), 
4. red (Rajas is high, Sattva is mid, Tamas is low), 
5. yellow (Sattva is high, Tamas is mid, Rajas is low) and 
6. white (Sattva is high, Rajas is mid, Tamas is low). 

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(The Vishnu Purana gives non-living things, lower animals and birds, humans, Prajapatis, gods and the Kumaras are respective examples of the above colours.) Sanat-kumara elaborates further how a Jiva (living entity) journeys from dark to white in his various births, ultimately gaining moksha if he does good deeds, devotion and yoga.

1. ^ Mahabharata Published by Geeta Press in Gorakhpur. Written in Hindi.
2. ^ The Mahabharata of Krishna-Dwaipayana Vyasa Santi Parva translated by Kisari Mohan Ganguli [published between 1883 and 1896]

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Four Incarnations Due to Four Kumar / Note / Links

Once Attracted by the smell of tulasi on vishnu's neck - the four kumars approach vaikunta  
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- but are blocked by

1. Jaya 2.Vijay Door Keepers of Vishnu

http://en.wikipedia.org/wiki/Jaya-Vijaya
https://www.youtube.com/results?search_query=Jaya+Vijaya+vishnu 

Due to Curse of Four Kumars 

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Take Four Incarnations as

1. Hiranyakshipu, Hiranyaksha
2. Ravana, Kumbahkarana
3. Shishupala, Dandavakra
4. Jagai, Magai

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To Liberate Them Vishnu Appears as Four Incarnations

1. To liberate Hiranyakshipu - Narasimha
2. To liberate Hiranyaksha - Varaha
3. To liberate Ravana, Kumbahkarana - Rama
4. To liberate  
1. Shishupala, Dandavakra - Krishna 
2. Jagai, Magai - Sri Krishna Chaitanya - Krishna as a Devotee with Radha Bhav