Apparently, Paul recognizes he and the other apostles are the personal property – the legacy – of God. Christ the Son presents them as gifts to God the Father. Christ reconciles them to God through His death and resurrection. As a direct result, God “puts in” them the Word of Reconciliation. Therefore Paul and the other apostles know firsthand what it means to be forgiven, to have sins, trespasses, and debts no longer counted against them.
Paul writes to the church at Corinth, “We are ambassadors,” and as such, “we implore you on behalf of Christ, be reconciled to God.”
“To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation. 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.” 2 Corinthians 5:19-20 KJV