Christian missions is an intentional effort to lead others to a saving faith in Jesus Christ. The word "mission" comes from the word "to send," and most Christians who are involved in full-time missions are sent to another location. All missions include the idea of leaving the comfort of the fellowship of other believers to engage with those who do not know Christ. This may be across town or on the other side of the globe.
Christian missions is mainly covered in the New Testament, though the Old Testament contains principles about missionary work. God’s people were to be “a light to the nations” (Isaiah 49:6), just as Christians should be today. God told His prophet Ezekiel that when He gave him a warning to give to the Israelites, if Ezekiel didn’t deliver that message, he would be punished for keeping quiet. Both passages show that believers are responsible for sharing God’s Word. The New Testament makes this charge more overt with Jesus giving His disciples the Great Commission (Matthew 28:18-20). The missionary work of the apostle Paul is recorded in much of the remainder of the New Testament. Paul’s approach was to preach the gospel, but adapt his approach to his audience (1 Corinthians 9:20). A good example of this is when he addresses the men of Athens (Acts 17:22-34). Every believer is called to participate in missions, learning to love as God loves and making the sharing of His truth central to life.
Christian missions continues in a variety of ways today, including people physically leaving their cultures to share the good news of Jesus—sometimes for shorter periods and often making the new culture their new home, building relationships and investing in making disciples—and even in people sharing about Him online.
The way in which Christian missions spreads the gospel differs for every culture, even though the message is the same. To some degree, the method must be specific to the hearers. Different degrees of education, sophistication, and familiarity with Christian concepts will influence how the gospel can be shared.
But the core message is the same. God is perfect and holy. We cannot please Him because of our sin. We deserve death and eternal separation from God. We need someone who can earn forgiveness for us. That person is Jesus—the second person of the triune God who took on human flesh and is forever fully God and fully man—who lived a perfect life, died on the cross for our sins, and rose back to life proving He is who He claims and that His sacrifice was sufficient atonement. If we entrust ourselves to Jesus, He will reconcile us to God and give us His indwelling Holy Spirit who transforms us; we will spend eternity in paradise with Him (John 3:16-18; 2 Corinthians 5:17-21; Ephesians 1:3-14).
Every Christian is called to missions in their own lives. Jesus charges all of us to reach others with His message. It is not easy, but as we learn to love people like God does, we find sharing the truth about God essential to the Christian life.