1. Mahamuni Babaji- The divine Himalayan Yogi, The Kriya sutras
2. Lahiri Mahasay and his personal letters
3. Masters of the Original Kriya,and
4. The master and disciple- The Righteous way: Guru-Param-Para

Vidyaratna Babaji (Swami Satyeswarananda Maharaj) was educated as a resident student for eight years in the hermitage school.
He learned Kirya from Swami Satyananda with whom he was closely associated for long twenty years.
Graduated from the University of Calcutta with a B. A. Philosophy honors, received an M.A. in philosophy specializing in Vedanta philosophy, concurrently received a LL.B.(Law) degree, and also worked for Ph.D. program.
He was a professor of law and an advocate (attorney).
He entered into the order of Swami with the blessings of Jagatguru Sankaracharya Swami Krishna Tirtha Bharati of Puri Gobardhan Math and Bidyananda Presided over the ceremony.
He lived in a small hut for twelve (12) years in Dunagiri Hill, Himalayas; sometimes with Mahamuni Babaji who frequently visited him.
Suddenly, without taking a vow, he observed Continuous Silence...(akhanda mouna) for three long years and was known as silent sage, Mouni Baba, Mouni Swami.
In 1974, he received "Kriya Sutra" the message of Mahamuni Babaji at Dunagiri Hill Himalayas.
In 1975, at the instruction of Babaji, he toured the world and lectured in European countries.
In 1976, Mahamuni Babaji initiated him into Purna Kriya in the Himalayas and commissioned him to re-establish the Original Kriya.
In 1982, Mahamuni Babaji sent Vidyaratna Babaji to America. He was lived in America ever since.
He has authored more than forty-five (45) books. Some of them are as follows:
1. Babaji and His Legacy,
2. The Divine incarnation
3. Biography of a Yogi, volume 1
4. Kriya: Finding the true path,
5. The six systems (Sara Darsan), and
6. The Holy Bible: In the light of Kriya.

As a sannyasi, he lives and stays alone; and eats meals prepared by himself (swapak). Like Mahamuni Babaji and Lahiri Mahasay, he is free of asrams, centers and organizations. As a servant of all (sakaler das) he serves only the qualified, since and serious seekers of truth form San Diego, California (U.S.A)

The following letter is one of eighty-one letters written by Swami Satyananda Giri to the author during his monastic training from 1950 to 1971. Swami Satyananda Giri was initiated by Hangsa Swami kebalananda and he was the chief monastic disciple and spiritual successor of Swami Sriyukteswar Giri in Indai.

Satyananda lived in the hermitagesat the Karar Asram, Puri (from 1919 to 1921), at Ranchi (from 1922 to 1941), and at Sevayatan (from 1943 to 1971). When he was not at the hermitage, he would go around the country to help spiritual seekers from these hermitages and to visit the other branches. He was a divine yogi, poet, musician, educationist and philanthropist. He held multiple positions and responsibilities as follows:

He was appointed "Asram Swami" (the monk of the hermitage) at Puri Karar Asram in 1921 by Sriyukteswar.

During the years 1922 to 1941, he was the principal of Ranchi Brahmacharya Vidyalaya (school). He was the founder and executive secretary- General of Yogoda Sat Sanga (YSS) society of India (1936 to 1941). He was a life member of YSS and the third president of Sadhu Sova (from 1952 to 1971), a society of Swamis founded by his mentor Swami Sriyukteswar. In addition, he was the first president (from 1953 to 1971) of Sat Sang Mission, Sevayatan (Seva means "service", ayatan means "house"; Sevayatan, then, mens "Service center"). The hermitage Sevayatan, where Satyananda lived the last twenty-seven years of his life, offers many programs, such as a postgraduate teacher training college, junior technical school, boys' high school, basic education for boys, junior high school for girls, hospital with outdoor and indoor facilities, library, press, and a yoga temple. Some of these programs are financially sponsored by the state government of west Bengal. The institutions mentioned are residential.

The author started his monastic training under Satyananda during his teen years, simultaneously continuing to study for eight years at Satyananda's brother disciple Paramhansa Yogananda's hermitage, YSS.

Satyananda was asked specifically by Babaji, the divine Himalayan Yogi, to train young Satyeswarananda, the author, in Kriya and to give appropriate monastic training. Later, the author lived several years with Babaji in the Himalayas to study further intricacies of Kriya science.