Justin Taylor: Spiritual adoption is a big deal for the practical theology of J. I. Packer. In Knowing God J. I. Packer writes: If you want to judge how well a person understands Christianity, find out how much he makes of the thought of being God’s child, and having God as his Father. If this is not the thought that prompts and controls his worship and prayers and his whole outlook on life, it means that he does not understand Christianity very well at all. He says that if he were to focus the New Testament message in three words, he would choose adoption through propitiation. “I do not expect,” he writes, “ever to meet a richer or more pregnant summary of the gospel than that.” How would Packer summarize the whole of New Testament teaching? a revelation of the Fatherhood of the holy Creator. He summarizes the whole of New Testament religion as the knowledge of God as one’s holy Father.
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