2 Corinthians 5:17 really is a picture of a born again Christian. I love this description "if anyone is in Christ he is a new creature, the old things passed away; behold new things have come.” But it doesn't stop there! Verse 15 says He died for us so that we may live, but no longer for ourselves, but for Jesus.
So what does Jesus want us to be doing ? What's our "purpose"? Continue to read verse 18-20 and Paul spells it out. God reconciled us to Himself and gave us the ministry of reconciliation. Paul says in that we are ambassadors for Christ, and the Apostle Paul himself was begging for the lost to reconciled to God.
What is the message of reconciliation? The Gospel! Verse 21 spells it out, Jesus diedto pay a debt we couldn’t pay. A born again Christian should never, ever, wonder what their purpose is. Chapter 6 and verse 2 says to not turn away the gospel, today is the day of salvation.
Have you died to yourself, embraced the message of reconciliation? Do you consider yourself an ambassador for Jesus Christ? That is our purpose.