The document discusses what it truly means to be a Christian. It argues that Christianity is not just a religious system of beliefs, moral system of dos and don'ts, or social/humanitarian system. Rather, the essence of Christianity is union with God through the death and resurrection of Jesus Christ. It is a relationship initiated by God's mercy and love, not by human works. In Christianity, believers become a new creation and participate in Christ's life. The goal is to seek God's kingdom and not worry about earthly things, as God provides for all needs. As children of God, Christians are brothers and sisters and their real citizenship is in heaven.