Matthew 24:14
All Nations Will Hear the Gospel
24 And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come.
Acts 1:8
The Disciples Will Be Jesus' Witness for the Gospel to the Ends of the Earth
8 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.
Jesus tells us that all nations will hear the gospel...So before Jesus' Second Advent, everyone will have heard about the Good News of Jesus Christ...The Kingdom of God will be preached to all nations as a testimony to the Truth...The gospel will be heard to the ends of the earth...And then the End of the Ages will come...