The Certainties of the Christian Life. 1 John 1:1-10 [Is Jesus Real In You?] John opens his letter to present Christ as both the life and light of believers.We see John’s proclamation in verse 1-2.We see John’s John’s Purpose in verse 3-4.The facts of Christ light to all believers in verses5.We see the fruits for that light in verse 6-10.The problem of sin has been solved by the atoning sacrifice of Jesus Christ — not only the sins of your past, but the sins of your future as well. And not only your sins, but also the sins of the whole world. Jesus paid the price for them all. Once you’ve become accustomed to living in his light, it’s no longer a question of “how much sin can I get away with?” It becomes a question of “How much sin can I get rid of?” That’s because nothing in the world compares with the brilliance of walking in the light of God’s love.