Already a nun and schoolteacher in Kolkata, Mother Teresa described a “call within a call” on a train to Darjeeling in September 1946 — to leave the convent and serve the poorest of the poor. Four years later she founded the Missionaries of Charity. She was canonised in 2016.
Her own words gathered in Come Be My Light (2007) — copyrighted, cited only; Vatican and Britannica records.
Sources & further reading