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)
Free: get it — here or in the Christian Classics app — and it's yours to read and listen to on every device you sign in to. About a tenth of it can be read here first, free.
Opening with Hebrews 12:18–29, Austin-Sparks considers the kingdom that cannot be shaken and the cross of Christ as its foundation. Through Hebrews, he traces the finality of Christ’s person and work, the heavenly calling of believers, and their training as sons for God’s purpose of dominion. Readers are called to leave earthly and traditional religion behind, receive the kingdom, and grow toward spiritual maturity in Christ.