World evangelisation is the most important task the Lord Jesus committed to His disciples and to us by extension: Go ye into all the world, and preach the gospel to every creature (Mk. 16:15).
This commission applies to all Christians in all ages. Because the survival of the church on earth is so dependent on evangelisation and missionary work, it is expected of each member to be involved in this task in some capacity. It has never been easy to spread the message of Christ in a hostile world, therefore, the messengers need to be equipped with the necessary divine power: But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto Me both in Jerusalem, and in all Judea, and in Samaria, and unto the uttermost part of the earth (Acts 1:8).
Although other disciples had already moved into Samaria with the gospel message, Paul laid the foundation for the church among the Gentiles. He greatly rejoiced over the first people who repented and were saved on account of his preaching. To the congregations in Philippi and Thessalonica, respectively, he said: Therefore, my brethren dearly beloved and longed for, my joy and crown, so stand fast in the Lord, my dearly beloved (Phil. 4:1). For what is our hope, or joy, or crown of rejoicing? Are not even ye in the presence of our Lord Jesus Christ at His coming? (1 Thes. 2:19).
To everyone who leads lost souls to Jesus, the crown of rejoicing will be given at the judgement seat of Christ. This is a highly esteemed calling in the kingdom of heaven, which is why soul-winners are compared to shining stars they have brought the light of the world, Jesus Christ, the Sun of Righteousness, to a lost, dark world, so that others can find their way to Calvary and to a new life in Him: And they that be wise shall shine as the brightness of the firmament; and they that turn many to righteousness as the stars forever and ever (Dan. 12:3).