‘I am debtor.’ Here is a third motivating influence.
If God did not use human instruments, the picture of debt would not be appropriate. God is not in debt to any. The gospel is pure grace, and mercy is not owed to any. But Paul could speak in this way, because God has made Christians debtors to a lost world. Like the lepers we say, ‘We do not well: this day is a day of good tidings, and we hold our peace: if we tarry till the morning light, some mischief will come upon us: now therefore come, that we may go and tell the king's household’ (2 Kings 7:9). In reality we have a transferred debt. Every saved person has a tremendous, unpayable debt to God. It is his will that we discharge that debt partly by telling this lost world about Christ. It is our privilege, but also our duty. At times it was so hard that Paul needed to remind himself of his duty. Paul’s heart was large in imitation of the Lord’s heart.
That is the big objective of gospel preachers today, to keep up, to know how to preach to the unchurched. ‘Debtor’ – it's a great word. All the modern translations, with only one or two exceptions, go for a different word. They say, I am obligated to Greeks and barbarians. That's a big shame. Both words mean much the same: I'm obligated, I have a legal or a moral duty to do something; I have a debt, I have a legal or a moral duty to pay that money, to honour that undertaking. Yes, they have the same meaning, but not quite the same. To be obligated – it's a word without any feeling attached to it. I don't want to have to do this, but I'm obligated. The word ‘debt’ in its Bible usage is used in connection with terms like burden or shame or sorrow. Somehow, there's more feeling attached to debt. It reflects the heart of the apostle. ‘God has commissioned me to reach these people. He has given me a lamp in a dark place. If I don't use it, they will stumble and fall. If it were not for them’, says the apostle, ‘I wouldn't be an apostle. I must with all my heart reach and win those people.’