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 John’s vision of the holy city in Revelation 21 and the believer’s coming to the heavenly Jerusalem, Austin-Sparks reads the New Jerusalem as a spiritual picture of Christ and His Church, formed for the full expression of Christ. Its imagery—gold, crystal, wall, precious stones, and the tree of life—points to God’s nature, love, grace, and divine life. The reader is called to move from symbols to spiritual reality and to know Christ’s life at work in the Church. First published in "A Witness and A Testimony" magazines, Nov-Dec 1966 (Volume 44-6) through May-June 1968 (Volume 46-3), from messages given at the Aeschi (Switzerland) Conference in September, 1966.