Gnanapragasam was born on 13 May 1948 in
Karampon on the island of
Velanaitivu in northern
Ceylon. As a young boy serving as an altar boy at St Mary's Church, Kayts, that he showed signs of his vocation to become a priest. At the age of ten he conveyed his desire to his family that his ambition is to become a priest of a God and begged them continually to send him to the seminary. The parents took Justin to late Bishop Rt. Rev. Dr. Emilianspillai and requested his admission to the seminary. He had his primary education at St Anthony's College, Kayts. Bishop Emilanasapillai permitted him to be admitted at the seminary and Justin entered St Martin's Minor Seminary Jaffna in 1959 and continued his secondary education at
St Patrick's College, Jaffna and gained admission to the National Seminary in Kandy. After completing his studies in Philosophy at the National seminary in Kandy, he then entered to Papal Seminary in Pune and studied theology from 1972 to 1974. ==Career==