Moral life is the highest life is the principle of ancient Tamils. Morality means good conduct. Justice literature is written with the intention of vindicating people. Vilampinaganar is the author of Nanmanikadigai among the eighteen books. There are one hundred and six songs in this book. He has given four comments in each song of the book. The purpose of this article is to highlight the morals, love, friendship, environment, hospitality, education, etc. of the individual's life principles recorded in this book.

1. Eighteen Books, Source and Commentary – Volume II – Tamil Center, Varthamanan Publishing House, 2007
2. Ramasubramaniam, MA (Narrator) Eighteen Lower Accounts Volume 1 Chellappa Publishing House, Madurai -625001 First Edition -2009
3. Ramasubramaniam, MA (Narrator.) Eighteen Lower Accounts Volume 3 Chellappa Publishing House, Madurai -625001 First Edition -1999
4. Padmadevan, Tamilpirian (Narrator.) Judicial Book Archive Kotavai Publication Chennai -600017 First Edition -2014
5. Puliyurkesikan (Narrator) Tirukkural New Text – Poombukar Publishing House. 2010