T. Austin-Sparks emphasizes that life is the central theme of the Bible, beginning with the Tree of Life in Genesis and culminating in the New Testament's revelation of eternal life through Jesus Christ. He contrasts two kinds of life: the natural life common to all creatures and the superior, eternal life that is only found in Christ. Sparks argues that the natural world symbolizes deeper spiritual truths, and that the choice between life and death was established early in human history through the symbolic trees in the Garden of Eden. Ultimately, he asserts that possessing eternal life through Christ is essential for fulfilling God's divine intention for humanity.