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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Drawing on Isaiah 34:8 and other passages, Austin-Sparks presents Zion as the spiritual reality at the heart of conflict between God and the nations, and between God’s purpose and merely natural or formal Christianity. He traces the controversy into Christian profession and ministry, calling readers to discern what is of the Spirit, seek heaven’s light, and serve God’s full purpose only under His sovereign direction. First published in "A Witness and A Testimony" magazines, 1956.