After God created the world, sin quickly entered his good creation. In the midst of that first act of human rebellion God made a promise to send a deliverer who would rescue this world from sin and defeat all evil--including death itself.
At the incarnation, the promised one is here! Jesus Christ entered his creation as a child. He came to give his life as a ransom. He came to rescue his people from their sins.
In these chapters we have an amazing description of who Jesus is. In response, those who hear and believe glorify God and tell others. The same should be true for you.