Charles Spurgeon Commentary Acts 26:19-23

"Wherefore, O king Agrippa, I was not disobedient unto the heavenly vision: but declared both to them of Damascus first and at Jerusalem, and throughout all the country of Judaea, and also to the Gentiles, that they should repent and turn to God, doing works worthy of repentance. For this cause the Jews seized me in the temple, and assayed to kill me. Having therefore obtained the help that is from God, I stand unto this day testifying both to small and great, saying nothing but what the prophets and Moses did say should come; how that the Christ must suffer, [and] how that he first by the resurrection of the dead should proclaim light both to the people and to the Gentiles." — Acts 26:19-23 (ASV)

Whereupon, O King Agrippa, I was not disobedient unto the heavenly vision: but shewed first unto them of Damascus, and at Jerusalem, and throughout all the coasts of Judaea, and then to the gentiles, that they should repent and turn to God, and do works meet for repentance. For these causes the Jews caught me in the temple, and went about to kill me. Having therefore obtained help of God, I continue unto this day, witnessing both to small and great, saying none other thing than those which the prophet and Moses did say should come: that Christ should suffer, and that he should be the first that should rise from the dead, and should shew light unto the people, and to the Gentiles.

Paul stuck to the Scriptures, and to the gospel revealed in them, and was not one who simply expressed his own thoughts, ideas, and notions; but he was a herald proclaiming what his King commanded him to say, and making known what the grace of his Master made him only too glad to say.