“How are they to preach unless they are sent? As it is written, ‘How beautiful are the feet of those who preach the good news!’” (v. 15). - Romans 10:15
According to J. Howard Edington, "people who don't believe in missions have not read the New Testament. Right from the beginning Jesus said the field is the world. The early church took Him at His word and went East, West, North and South." Also, Count Nicolaus Ludwn Zinzendorf once said "I have but one passion: It is He, it is He alone. The world is the field and the field is the world; and henceforth that country shall be my home where I can be most used in winning souls for Christ." Furthermore, C. S. Lewis asserted that "the Church exists for nothing else but to draw men into Christ, to make them little Christs. If they are not doing that, all the cathedrals, clergy, missions, sermons, even the Bible itself, are simply a waste of time. God became Man for no other purpose."Therefore, as stated by, Hudson Taylor, "the Great Commission is not an option to be considered; it is a command to be obeyed."
Evangelism is one way in which we can fulfill Christ’s call to be His witnesses (Acts 1:8). In biblical categories, witnessing involves making visible what is otherwise invisible. The reality to which we bear witness is the invisible kingdom of God, and in witnessing we strive to make the Lord’s reign visibly manifest. Among the many ways we can bear witness to Jesus is through loving our fellow believers. We reveal to the world that we belong to our Savior when we love other Christians (John 13:34–35). Celebrating the Lord’s Supper proclaims visibly the Lord’s death until He comes again (1 Cor. 11:26). In preaching the life, death, and resurrection of Jesus in our evangelism, we are also helping to make visible the invisible reality of Christ.
The distinction between witnessing and evangelism is important because it is easy to think we are evangelizing when all we are doing is bearing witness to the Savior. Giving one’s testimony is a good thing, but it is not evangelism. Testifying to the work of God in our lives bears witness to what Christ has done for us; it does not by itself give the content of the Gospel. Living a righteous life manifests the work of the Holy Spirit, but we have not evangelized our neighbor if we have never shared the Gospel with him. No one is converted by our kindness or honesty; they are brought into the kingdom of heaven only through repentance and faith in Jesus Christ (Acts 16:25–34).
God has created us with different personalities and gifts, and some of us are more adept at the verbal proclamation of the Gospel than others. Nevertheless, declaring the message of salvation through Christ is the responsibility of us all, and we must seek opportunities to preach the Gospel. Only if we confess Him before men will He confess us before the Father (Matt. 10:32–33).