Durga Charan Nag was born on 21 August 1846 in the village of Deobhog in East Bengal. He left the body in December 1899.

Sri Ramakrishna's disciples: Naren, Swami Vivekananda; Shashi, Swami Ramakrishnananda ; Hari (nath), Swami Turiyananda;
Gangadhar, Swami Akhandananda.

Thakur (Lord): Another name for Sri Ramakrishna.

Panchavati: A sacred grove of five trees (banyan, pipal, ashoka, amalaki and bel) which was planted by Sri Ramakrishna at Dakshineshwar (panch = five). Sri Ramakrishna used to go there to meditate, especially at night.

Prasad: Food that has been sanctified by offering it to the Divine.

The cover portrait of Nag Mahashay: Nag Mahashay always refused to be photographed during his lifetime. After he had left the body, his disciples took a photograph of him before the body was cremated. From this photograph, an oil painting was drawn. It is this likeness which is widely revered today.