As per Manusmiriti 3.1 :
" A student should observe Brahmacharya and study the Vedas with their subsidiary subjects for 9, 18, 36 years, or until they are completely mastered".
1. The lowest - "Man, who is composed of a body - formed out the elements derived form foods and drinks - and a soul that resides in the body, is verily a Yajna...
“Let them conduct themselves properly, and study and teach, be truthful in word, deed, and thought and..
1)Satyarth Prakash by Swami DAYANANDA SARASWATI Udeypur, 1939 Vikram, Bhadarpud Shukula Paksh (A.D. 1882).
2)Relevant Upanishads and Manusmiriti verses.