He is free from distracting business relations with his brethren and brotherly love may abound. The exhortation of Paul is in connection with brotherly love, and of all external relations, debt hinders the free flow of sympathy among brethren.
The early disciples endeavored to avoid all debt. Much less did they pay a premium for the privilege. They only borrowed in hard necessity; but borrowing on usury to make a profit by it was as repellant to the Christian conscience then as complicity with theft or fraud. It marked a man as anxious to share in unrighteous gain. His own conscience placed him among those who are discontented with their lawful estate and guilty of that covetousness which is idolatry. I Tim. 6:6-11: "But godliness with contentment is great gain. For we brought nothing into this world, and it is certain we can carry nothing out. And having food and raiment, let us be therewith content. But they that will be rich fall into temptation and a snare, and into many foolish and hurtful lusts, which drown men in destruction and perdition. For the love of money is the root of all evil: which while some coveted after, they have erred in the faith, and pierced themselves through with many sorrows. But thou, O man of God, flee these things; and follow after righteousness, godliness, faith, love, patience, meekness."