Agnes Gonxha Bojaxhiu was born August 26, 1910 in Skopje, in Macedonia. Her childhood was comfortable and prosperous due to her father's success. Her father encouraged his children to be generous and compassionate to those less fortunate. Her mother was very religious and she took the children to morning mass. Agnes often helped her mother deliver parcels of food and money to the poor and prayed with the whole family every evening. The family's life changed dramatically after their father's death, when Agnes was 9. Although now poor themselves, they continued to help those less fortunate. Christianity became increasingly important in Agnes" life. From the age of 12, she was aware of a desire to devote her life to God. As Agnes thought about what she could do for Christ, she started to feel a call for God. In the two years she decided to become a nun. Agnes spent longer periods of time going on retreats and received guidance from her Father Confessor. At the age of 17, she made the decision to become a nun, because she had been taught that chastity is a special and pure grace. This was an important moment for Agnes as she chose a life of self-sacrifice. .
Agnes was just 18 when she decided to join the Sisters of Our Lady of Loreto, who were very active in India. On December 1, 1928 the crossing to India started. In the beginning of 1929 they reached Colombo, then Madres and finally Calcutta. The journey continued to Darjeeling, where she completed her training. Agnes was trained in prayer, scriptures, theology, and the spirituality and history of her Order. She started to learn Hindi and Bengali and to improve her English. She taught at the local school and worked in a small medical station. On May 24, 1931, Agnes took her first vows of poverty, chastity and obedience as a sister of Loreto. She chose her name in religious life as St. Theresa of Lisieux. Soon after she went to Calcutta to begin her teaching career.