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 from Galatians, Romans, and Acts, Austin-Sparks presents Pentecost as a turning point in God’s purpose: through the coming of the Holy Spirit, believers are brought into sonship in Christ and the new spiritual creation begins. He traces the Spirit’s work as seal, power, and witness, and calls readers to live in the reality of God’s presence and Christ’s place of glory, with creation awaiting the full revealing of God’s children. Transcribed from messages given at an Easter conference in May 1959. The spoken form has been retained verbatim.