John was one of the closest disciples of Jesus. He was not only an eyewitness of the great signs that Jesus performed but he also wrote the words of Jesus so that those who believe in Jesus as God's Son and God's King would have true and lasting life in his name. In a world of darkness, Jesus is the light of life for all.
The Christian life is a radically confronting and compelling life. This is what Jesus teaches his followers in the sermon on the mount. To live like Jesus and for Jesus is counter-cultural and yet is attractive to others like no other lifestyle. These words of Jesus are as timeless and relevant as when Jesus first spoke them to his first followers.
The apostle James - the brother of Jesus - gives punchy, practical wisdom for followers of Jesus. The word of God planted in our lives can save us when we have faith in Jesus, but this faith needs to be lived out in genuinely changed lives.