Sunder Satguru you kahen

Sunderdas was a noted saint, poet, philosopher and social reformer of medieval India. He was a disciple of Dadu Dayal. Sunderdas was born in 1596 in Dausa in Rajasthan state in India. Sant Sunderdas composed about 48 books. He is revered as ‘The Sankaracharya’ of Hindi literature’. He died in 1689. He is popularly known as Sant Kavi Sunderdas.He openly opposed Casteism, communal parochialism, and indulgence in hypocrisy.
Sant Sunderdas composed about 48 books, such as ‘Gyan Samudra’, Sarvangyoga Pradipika’, ‘Panchendriya Charitra’, ‘Sukh Samadhi’, Guru Sampradaya’, ‘Bhram Vidhwans Ashtak’, Ramashtak’, ‘Punjabi Bhasha Asktak’, ‘Pir Murid Ashtak’, ‘Barahmasan’, ‘Ayurbal Bhed Ashtak’, ‘Purabi Bhasha Ashtak’, ‘Sakhi Granth’, ‘Padavali Granth’, ‘Savaiya Granth’ and ‘Chitrabandh Rachnayen’ etc.In his works, along with the form of Braj language in Hindi, combination of Avdhee, eastern dialect, Gujarati, Punjabi, Sindhi, Khariboli, Marwari, Urdu and Sanskrit is found.
Rabindranath Tagore has rightly said, among philosophical poets, Siunderdas alone was a scholar well versed with the scriptures. He was not only a poet but a research scholar also.
On Kartik Shukla Ashtami (Gopashtami) Samvat 1746 Vikram (1689 AD), at the age of 93, Sant Sunderdas left for his heavenly abode. In his last couplet, he said that death is the union of spirit with god and, therefore, it is nothing but a festivity.