Nirmal Hriday literally means pure heart. In 1952 Kali temple hostel domatery which was donated by city of Kolkata was made Home for Dying Destitutes and was named "Nirmal Hriday".The Missionary worked for dying poors in peaceful way. The Nirmal hriday was expanded and the first house outside Kolkata was at Drachi. Soon it expanded in Delhi and other places. Centalized at Calcutta.Mother Teresa expanded her work globally and with more than 500 missions in 120 countries.