This document discusses the church's mission of evangelization and the proclamation and establishment of God's kingdom. It defines key terms like evangelization, which refers to proclaiming the good news of God's kingdom. It explains that the fundamental mission of Christ was to proclaim that the kingdom of God is at hand and to reform people's lives and have them believe in the gospel. It also defines what the kingdom of God is, describing it as God's gift that people can accept or reject through faith, a state of life where love, justice, truth and peace reign, beginning in the present and fulfilling in the hereafter.