Acts 22:14

And he said, The God of our fathers hath appointed thee to know his will, and to see the Righteous One, and to hear a voice from his mouth. For thou shalt be a witness of him unto all men of what thou hast seen and heard.

To know his will ... Here is prophetic testimony that Paul is to be trusted as one who knows God's will.

To see the Righteous One ... This is testimony of the holiness and perfection of Christ.

Witness unto all men ... This clearly meant that Paul was commissioned from above to preach the gospel to Gentiles; for are not Gentiles men? Up to here, however, Paul had not spoken the despised word, Gentiles.