John has been teaching his readers about the hope they have in Christ. Those who abide in Christ have confidence and will not shrink back when Christ returns. When he appears, we shall be like him and we will see him as he is. This is the hope of those who are born of God. This hope is the motivation for our purification. We must clean out the filth in our lives and stop practicing sins because we see the amazing love the Father has given us so that we can be called children of God.
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