Romans 15:17 - Matthew Poole's English Annotations on the Holy Bible

q.d. Having received this grace of apostleship, anti having had great success in my labours, multitudes being converted by my ministry: I have whereof to glory, or, I have matter of glorying and rejoicing. But then he adds, that this glorying of his was not in himself, but in and through Jesus Christ, by whose grace he did what he did: see 1 Corinthians 15:10. And also, that it was not in any thing that concerned himself, but in things pertaining to God, which concerned his worship and service, and wherein his ministry consisted. In the foregoing verse he described his apostleship in terms that were borrowed from the Levitical priesthood: and here, contriving the same metaphor, he calleth the execution of his function, a performing of things pertaining to God. which is that for which the priests of old were ordained, Hebrews 5:1.