These Mahatmas are always anxious to preach the universal message of peace mentioned in the Bhagavad-gita and it does not matter in whatsoever Ashram he belongs to. Arjuna was a householder Ksatriya and was fighting for the interest of the Lord and as such he was the first Acarya in the parampara line.
Arta, Artharthi, Jnani and Jijnasu are the beginners in the line of understanding the Geeta. The Mahatmas are above all these four classes of men and they are the post graduate men in the line. We know also the Ashuras who are divided into four classes namely the Duskrtinas, the Mudhas, the Naradhamas and the Foolish scholars.