Swami Vivekananda [ 12 January 1863 – 4 July 1902], born Narendranath Datta was an Indian Hindu monk, a chief disciple of the 19th-century Indian mystic Ramakrishna. He was a key figure in the introduction of the Indian philosophies of Vedanta and Yoga to the Western world and is credited with raising interfaith awareness, bringing Hinduism to the status of a major world religion during the late 19th century. He was a major force in the revival of Hinduism in India, and contributed to the concept of Indian nationalism as a tool of fight against the British empire in colonial India. Vivekananda founded the Ramakrishna Math and the Ramakrishna Mission. He is perhaps best known for his speech which began with the words - "Sisters and brothers of America ...," in which he introduced Hinduism at the Parliament of the World's Religions in Chicago in 1893. Born into an aristocratic Bengali Kayastha family of Calcutta, Vivekananda was inclined towards spirituality. He was influenced by his guru, Ramakrishna, from whom he learnt that all living beings were an embodiment of the divine self; therefore, service to God could be rendered by service to humankind. After Ramakrishna's death, Vivekananda toured the Indian subcontinent extensively and acquired first-hand knowledge of the conditions prevailing in British India. He later travelled to the United States, representing India at the 1893 Parliament of the World's Religions. Vivekananda conducted hundreds of public and private lectures and classes, disseminating tenets of Hindu philosophy in the United States, England and Europe. In India, Vivekananda is regarded as a patriotic saint, and his birthday is celebrated as National Youth Day. Works :- Lectures Although Vivekananda was a powerful orator and writer in English and Bengali, he was not a thorough scholar, and most of his published works were compiled from lectures given around the world which were "mainly delivered .impromptu and with little preparation". His main work, Raja Yoga, consists of talks he delivered in New York. Literary works According to Banhatti, "[a] singer, a painter, a wonderful master of language and a poet, Vivekananda was a complete artist", composing many songs and poems, including his favourite,"Kali the Mother". Vivekananda blended humour with his teachings, and his language was lucid. His Bengali writings testify to his belief that words (spoken or written) should clarify ideas, rather than demonstrating the speaker (or writer's) knowledge. Bartaman Bharat meaning "Present Day India"is an erudite Bengali language essay written by him, which was first published in the March 1899 issue of Udbodhan, the only Bengali language magazine of Ramakrishna Math and Ramakrishna Mission. The essay was reprinted as a book in 1905 and later compiled into the fourth volume of The Complete Works of Swami Vivekananda. In this essay his refrain to the readers was to honour and treat every Indian as a brother irrespective of whether he was born poor or in lower caste.