Theodore Austin-Sparks (1888–1971) was a British evangelist and author. Born in London, he became a Christian at seventeen while listening to street-preachers in Glasgow, and was ordained a Baptist minister at twenty-four. In 1926 he left the denomination and, with like-minded Christians, founded a conference and training centre at Honor Oak in south-east London. From there he published the free magazine "A Witness and A Testimony" until his death, and his conference ministry took him across Europe, North America and Asia. He asked that his messages be shared freely and word for word. Source: Wikipedia (summarized; CC BY-SA)
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Opening with Ephesians 3:9, Austin-Sparks explores the “mystery” as God’s once-hidden eternal purpose, now disclosed in Christ and entrusted especially to Paul. He follows this divine secret through Romans, Corinthians, Galatians, Ephesians, Philippians, and Colossians, emphasizing Christ’s pre-eminence and the Church as His Body. The message calls believers to seek spiritual understanding of Scripture and to live as a people shaped by God’s purpose.