He said to them, "Go into the whole world and proclaim the gospel to every creature. Whoever believes and is baptized will be saved; whoever does not believe will be condemned. These signs will accompany those who believe: in my name they will drive out demons, they will speak new languages. They will pick up serpents (with their hands), and if they drink any deadly thing, it will not harm them. They will lay hands on the sick, and they will recover." So then the Lord Jesus, after he spoke to them, was taken up into heaven and took his seat at the right hand of God. But they went forth and preached everywhere, while the Lord worked with them and confirmed the word through accompanying signs. (Mk 16:15-20)
Jesus after his resurrection instructed his disciples to go into the whole world. There was no restriction for them. The whole wide world was open for their ministry. Their only and the one job was to proclaim the gospel. This was to be done to every creature. Again Jesus gave an open ended mission. Proclamation of the gospel has no limitation, no restriction, no control, and no exclusivity.
Those who believe and are baptized will be saved. Their proclamation of the gospel has a goal in purpose. It is the salvation of the listeners. They are to be brought back to God. The requirements for this salvation are their belief and baptism.
The signs that will be noticed in the believers are that they will not be controlled by evil and the power of evil. In stead they will remove evil from the world and the people and they will do good to all. They will make the people whole and complete and they will be masters of the situation. Situation will have no domination over them. Presence of good and doing good will clearly indicate that they are believers.
