A Bengali, he was born in Shilaidaha. His father was the industrialist Dwarkanath Tagore.Debendranath was a deeply religious man. His movement, the Brahmo Samaj, was formed in 1843 by merging his Tattwabodhini Sabha with the Brahmo Sabha, ten years after the death of Raja Ram Mohan Roy, founder of the Brahmo Sabha. The Brahmo Sabha had fallen away from its original aims and practices, as stated in its Trust deed of Brahmo Sabha. However, Tagore aimed to revive the importance of this deed.
Although Debendranath was deeply spiritual, he managed to continue to maintain his worldly affairs – he did not renounce his material possessions, as some Hindu traditions prescribed, but instead continued to enjoy them in a spirit of detachment. His considerable material property included estates spread over several districts of Bengal; most famously, the Santiniketan estate near Bolpur in the Birbhum district, a later acquisition, where his eldest son Dwijendranath Tagore set up his school.
Debendranath was a master of the Upanishads and played no small role in the education and cultivation of the faculties of his sons.Debendranath Tagore was born to the Tagore family in Jorasanko, popularly known as Jorasanko Thakur Bari in North-western Kolkata, which was later converted into a campus of the Rabindra Bharati University. The Tagore family, with over three hundred years of history, has been one of the leading families of Calcutta, and is regarded as a key influence during the Bengal Renaissance. The family has produced several persons who have contributed substantially in the fields of business, social and religious reformation, literature, art and music. The family surname of the Tagores is Banerjee (Bandopadhyay).
As son of Dwarkanath Tagore, a close friend of Ram Mohan Roy, Debendranath came early into the influence of Brahmoism through the Brahmo Sabha, a reformist movement in Hinduism formulating as Adi Dharma (Original Dharma) what it considered as the original pristine principles of Hinduism corrupted over time.
But even earlier, deeply affected in childhood by the death of his grandmother to whom he was greatly attached, Debendranath was drawn to religion and began contemplating the meaning and nature of life. He commenced a deep study of religious literature, particularly the Upanishads. In 1839, with tutelage from Pandit Ram Chandra Vidyabageesh, a leader of the Brahmo Sabha, he formed his own active Tattwabodhini Sabha (Truthseekers’ Association) to spread his new experiences and knowledge.
In 1843, Debendranath started the Tattwabodhini Patrika as mouthpiece of the Tattwabodhini Sabha. In the same year, he revived the Brahma Sabha, fallen in vigour and following since the death of Ram Mohan Roy in 1833. The Brahmo Sabha was formally absorbed into the Tattwabodhini Sabha and renamed as Calcutta Brahma Samaj. The day Pous 7 of the Bengali calendar is commemorated as the foundation day of the Samaj. The Patrika became the organ of the Samaj and continued publication till 1883.
In 1848, Debendranath codified the Adi Dharma Doctrine as Brahmo Dharma Beej (Seed of the Brahmo Dharma). In 1850, he published a book titled Brahmo Dharma enshrining the fundamental principles. These principles emphasise monotheism, rationality and reject scriptural infallibility, the necessity of mediation between man and God, caste distinctions and idolatry.
With the influence of Brahmoism under Debendranath spreading far and wide throughout India, he gathered reputation as a person of particular spiritual accomplishment and came to be known as Maharshi. His spiritual stature was confirmed by Sri Ramakrishna, the great Hindu sage of the 19th century who paid Debendranath a visit. Debendranath’s roles in the Bengal renaissance and the reform and rejuvenation of Hindu religion are considerable.