He said to them, “Go into all the world and preach the good news to all creation. Whoever believes and is baptized will be saved, but whoever does not believe will be condemned.” (Mark 16:15-16)
Universalism is a deception — and whoever teaches it is deceived. Only those who actually CHOOSE Jesus as God and Lord and Savior will be saved. The “Great Commission” was given because there was actually a need for it. There was a need for the “already saved ones” to co-operate with the Holy Spirit so that others could be saved as well. That is why the Holy Spirit came — to empower us to be His witnesses throughout the earth. And we waste a great miracle and grace if we do not.
“But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.” (Acts 1:8)