What is the responsibility of every Grace Age believer as an ambassador for Christ?
Every Grace Age believer is an ambassador for Christ by telling the world that reconciliation is already accomplished—it is done and finished. Believers are not saved merely to sit or escape hellfire; they are saved to serve usefully in God's vineyard in whatever capacity He assigns to each one.
Les explains that because we are a new creature and a new creation in Christ Jesus, there is to be separation from the world. That leads to the tremendous responsibility of every Grace Age believer: we are ambassadors for Christ. Our job is to let the world know they have already been reconciled—it is done and finished. Les illustrates this with a government ambassador sent to a foreign country: he does not totally isolate himself; he stays in communication with the home government because he is an employee of that government. After teaching that we are ambassadors in chapter 5, the text moves into chapter 6 and says God did not save us to sit or merely to escape hellfire, but saved us to serve and be useful in God's vineyard in whatever particular capacity He gives each one. Verse 2 then quotes the Old Testament, from the book of Isaiah: Behold, now is the accepted time. Behold, now is the day of salvation.
Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ’s stead, be ye reconciled to God.
And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation;
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What does it mean that Christians are ambassadors for Christ?
Believers are ambassadors and representatives of heaven itself, speaking on God's behalf as though God were pleading through them: be reconciled to God.
What responsibility do believers have because their citizenship is in Heaven?
Because believers' citizenship is in Heaven, they are to carry out the designs, hopes, and aspirations of their heavenly homeland.