But rise, and stand upon thy feet: for I have appeared unto thee for this purpose, to make thee a minister and a witness both of these things which thou hast seen, and of those things in the which I will appear unto thee;

People's New Testament

26:16 I have appeared unto thee for this purpose. The mission of Paul to the Gentiles is described as being a part of the Lord's communication. In order that he might be a minister and a witness. It was needful that the apostle of the Gentiles should see Christ. He must be a witness that the Lord had risen. He was chosen for this work before conversion, because he was honest, deeply conscientious, and possessed the great qualities that were needful to fit him for the most important work ever assigned to man.

Jamieson-Fausset-Brown Bible Commentary

16-18. But rise, &c.-Here the apostle appears to condense into one statement various sayings of his Lord to him in visions at different times, in order to present at one view the grandeur of the commission with which his Master had clothed him [Alford].

a minister . both of these things which thou hast seen-putting him on a footing with those "eye-witnesses and ministers of the word" mentioned in Lu 1:2.

and of those in which I will appear to thee-referring to visions he was thereafter to be favored with; such as Ac 18:9, 10; 22:17-21; 23:11; 2Co 12:1-10, &c. (Ga 1:12).

Matthew Henry's Concise Commentary

26:12-23 Paul was made a Christian by Divine power; by a revelation of Christ both to him and in him; when in the full career of his sin. He was made a minister by Divine authority: the same Jesus who appeared to him in that glorious light, ordered him to preach the gospel to the Gentiles. A world that sits in darkness must be enlightened; those must be brought to know the things that belong to their everlasting peace, who are yet ignorant of them. A world that lies in wickedness must be sanctified and reformed; it is not enough for them to have their eyes opened, they must have their hearts renewed; not enough to be turned from darkness to light, but they must be turned from the power of Satan unto God. All who are turned from sin to God, are not only pardoned, but have a grant of a rich inheritance. The forgiveness of sins makes way for this. None can be happy who are not holy; and to be saints in heaven we must be first saints on earth. We are made holy, and saved by faith in Christ; by which we rely upon Christ as the Lord our Righteousness, and give up ourselves to him as the Lord our Ruler; by this we receive the remission of sins, the gift of the Holy Ghost, and eternal life. The cross of Christ was a stumbling-block to the Jews, and they were in a rage at Paul's preaching the fulfilling of the Old Testament predictions. Christ should be the first that should rise from the dead; the Head or principal One. Also, it was foretold by the prophets, that the Gentiles should be brought to the knowledge of God by the Messiah; and what in this could the Jews justly be displeased at? Thus the true convert can give a reason of his hope, and a good account of the change manifest in him. Yet for going about and calling on men thus to repent and to be converted, vast numbers have been blamed and persecuted.