This and the following verse should be read in a parenthesis. St. Paul, as the apostle of the Gentiles, wished to show them the high pitch of glory and blessedness to which they had been called, that they might have a due sense of God's mercy in calling them to such a state of salvation; and that they might be jealous over themselves, lest they should fall as the Jews had done before them: and he dwells particularly on the greatness of those privileges which the Gentiles had now received, that he might stir up the minds of his countrymen to emulation, and might be the means of saving some of them, as he states in the following verse.

I magnify mine office - This is a very improper translation of την διακονιαν μου δοξαζω, which is, literally, I honor this my ministry. Dr. Taylor has justly observed that magnify, except when applied to the most High, carries with it, in our language, the idea of stretching beyond the bounds of truth; whereas the apostle simply means that he does justice to his ministry, by stating the glorious things which he was commissioned to preach among the Gentiles: blessings which the Jews by their obstinacy had forfeited.

the apostle.

Romans 15:16-19 That I should be the minister of Jesus Christ to the Gentiles, ministering the gospel of God...

Acts 9:15 But the Lord said to him, Go your way: for he is a chosen vessel to me, to bear my name before the Gentiles, and kings...

Acts 13:2 As they ministered to the Lord, and fasted, the Holy Ghost said...

Acts 22:21 And he said to me, Depart: for I will send you far hence to the Gentiles.

Acts 26:17,18 Delivering you from the people, and from the Gentiles, to whom now I send you...

Galatians 1:16 To reveal his Son in me, that I might preach him among the heathen; immediately I conferred not with flesh and blood:

Galatians 2:2,7-9 And I went up by revelation, and communicated to them that gospel which I preach among the Gentiles...

Ephesians 3:8 To me, who am less than the least of all saints, is this grace given...

1 Timothy 2:7 Whereunto I am ordained a preacher, and an apostle, (I speak the truth in Christ...

2 Timothy 1:11,12 Whereunto I am appointed a preacher, and an apostle, and a teacher of the Gentiles...

I magnify mine office. Rather, 'I honour my ministry,' [diakonia mou doxazo.]

Spiritual Blindness.
"As it is written, God hath given them the spirit of slumber, eyes that they should not see, and ears that they should not hear."--ROMANS xi. 8. "Blindness in part is happened to Israel."--ROMANS xi. 25. It is a sad and painful reflection, and one which is continually forced upon us as we read the New Testament, that the long training and preparation of the Jews brought them at the last not to the acceptance but to the rejection of Jesus. They had been taught, generation after generation, that they …
John Percival—Sermons at Rugby

The Sovereignty of God in Operation
"For of Him, and through Him, and to Him, are all things: to whom be the glory for ever. Amen" (Romans 11:36). Has God foreordained everything that comes to pass? Has He decreed that what is, was to have been? In the final analysis this is only another way of asking, Is God now governing the world and everyone and everything in it? If God is governing the world then is He governing it according to a definite purpose, or aimlessly and at random? If He is governing it according to some purpose, then …
Arthur W. Pink—The Sovereignty of God

Reprobation Asserted: Or, the Doctrine of Eternal Election and Reprobation Promiscuously Handled, in Eleven Chapters.
WHEREIN THE MOST MATERIAL OBJECTIONS MADE BY THE OPPOSERS OF THIS DOCTRINE, ARE FULLY ANSWERED; SEVERAL DOUBTS REMOVED, AND SUNDRY CASES OF CONSCIENCE RESOLVED. BY JOHN BUNYAN OF BEDFORD, A LOVER OF PEACE AND TRUTH. 'What then? Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded.'--Romans 11:7 London: Printed for G. L., and are to be sold in Turn-stile-alley, in Holbourn. Small 4to, 44 pages. EDITOR'S ADVERTISEMENT. This valuable tract …
John Bunyan—The Works of John Bunyan Volumes 1-3