Augustine of Hippo, Of the Work of Monks Chapter 23

23. Hence arises another question; for peradventure one may say, “What then? did the other Apostles, and the brethren of the Lord, and Cephas, sin, in that they did not work? Or did they occasion an hindrance to the Gospel, because blessed Paul saith that he had not used this power on purpose that he might not cause any hindrance to the Gospel of Christ? For if they sinned because they wrought not, then had they not received power not to work, but to live instead by the Gospel. But if they had received this power, by ordinance of the Lord, that they which preach the Gospel should live by the Gospel; and by His saying, “The workman is worthy of his meat;” which power Paul, laying out somewhat more, would not use; then truly they sinned not. If they sinned not, they caused no hindrance. For it is not to be thought no sin to hinder the Gospel. If this be so, “to us also,” say they, “it is free either to use or not to use this power.”