The difference between what is written in the modern Bible and what it means is HUGE. I think many will agree that a person should be as though Jesus is real to them, they learn by him and they preach him and that they should do that to nations wherever they go.
THE DIFFERENCE is that now they go to preach. They go to convert people. Their purpose is to convert people.
If they just, "went", without the purpose of conversion, they would be free to do the work they love to do. While they are happy doing the work they love to do, whatever it is (must be legal) people will be drawn to them because they are happy people, free to do as they please, but for God's will be done.
If they go believing God's will is that they convert people, they will be doing their own will which is converting whoever they can.
Is it true that no one else can see the difference?