A purpose of John in writing this letter is: "that you may not sin." The purpose of the book is fellowship, and sin breaks fellowship. So he is writing that they may not sin and remain in fellowship with God. We then deal with Biblical Propitiation and in what way did John mean when he wrote "the whole world"? Texts 3-11 contain three claims to intimate knowledge of God, expressed by "whoever says". Just like the "if we say" section of chapter 1, each of these statements reflects, directly or indirectly, what the author believed the Gnostics falsely claimed and is followed either by a direct rebuttal or by a counterstatement.
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