From Dr Arul’s Blog at : http://anbudanarul.blogspot.com/
Malayalam: Motivated genesis of a language
It was not possible for the Nambudiris to abandon Sanskrit. For it was their mother-tongue; there existed a close relationship between Sanskrit and brahmanical culture; beside the term scholarship came to mean Sanskrit scholarship. But the indigenous people had no knowledge and interest in Sanskrit. Hence the Nambudiris felt the need of conveying their needs to the people through an intelligible medium; thus arose bhasamisra or manipravala.
- Aryans in South India (1992), p. 191 - 194