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Durga Charan Nag (Bengali: দুর্গাচরণ নাগ) better known as Nag Mahasaya (Maha Asayah in Sanskrit or "of great possession"), was born in 1846 in the village of Deobhog (Narayanganj district) in East Bengal, now Bangladesh. He was one of the householder disciples of Sri Ramakrishna Paramahansa. Sri Ramakrishna called him "a blazing fire" when he first saw him. According to the other disciples of Sri Ramakrishna, most notable among them being Swami Vivekananda, he was a shining example of renunciation and love for God. He shunned material wealth and regarded every human being as God on earth. He lived on a meager income, but spent most of it on serving the poor, his guests, and monks and ascetics.
Sarat Chandra Chakravarty, a direct disciple of Swami Vivekananda and the author of the book "Diary of a Disciple" (Swami-Sishya Sangbad in Bengali) wrote the biography on Nag Mahasaya. There is not much literature available on Nag Mahasaya, and most of the information on him can be obtained in works related to Sri Ramakrishna, his teacher and master, and Swami Vivekananda, the foremost disciple of Ramakrishna.
Swami Vivekananda mentioned to Sarat Chandra in a conversation about Nag Mahasaya - "All the characteristics of the highest type of devotion, spoken of in the scriptures, have manifested themselves in Nag Mahashaya. It is only in him that we actually see fulfilled the widely quoted text, "Trinadapi Sunichena". ("Lowlier than the lowly stalk of grass.") Blessed indeed is your East Bengal to have been hallowed by the touch of Nag Mahashaya's feet!"
In his hometown in Bangladesh, a foundation runs a charitable institution bearing his name.Nag died in 1899 in his home of Deobhog.