“But you will receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem and in all Judea and Samaria, and to the end of the earth.” (Acts 1:8)
In the same way that the first witnesses were empowered by the Holy Spirit to bring the gospel to the world, we are empowered as well.
When you go out “On Mission”, you do not go out in your own strength. You are empowered by the Holy Spirit. As you speak His Word, He drives that into the heart of man, convicting and calling them to Himself.
Be sure in your witness for the Lord is with you.