Whereupon, O king Agrippa, I was not disobedient unto the heavenly vision:

Whereupon, O king Agrippa, I was not incredulous to the heavenly vision:

So, then, King Agrippa, I did not go against the vision from heaven;

From then on, O king Agrippa, I was not unbelieving to the heavenly vision.

After that, King Agrippa, I did not fail to obey the heavenly vision;

He declareth now briefly to what end he rehearsed the history of his conversion; to wit, that Agrippa and the rest might understand that he had God for his author of all those things which the Jews condemned of sacrilege and apostacy. He speaketh to Agrippa by name, because he knew that Festus and the Romans knew not what an heavenly vision meant. Now, it appeareth that there is nothing in the very sum of his doctrine which dissenteth from the law and the prophets; whereby the oracle doth win greater credit, whereby Paul was commanded to teach nothing but that which was agreeable to the Scripture. Conversion, or turning unto God, is joined with repentance, not as some peculiar thing, but that we may know what it is to repent. Like as, also, on the contrary, the corruption of men and their frowardness [1] is nothing else but an estranging from God. And because repentance is an inward thing, and placed in the affection of the heart, Paul requireth, in the second place, such works as may make the same known, according to that exhortation of John the Baptist: "Bring forth fruits meet for repentance," (Matthew 3:8). Now, forasmuch as the gospel calleth all those which are Christ's unto repentance, it followeth that all men are naturally corrupt, and that they have need to be changed. In like sort, this place teacheth that these men do unskillfully pervert the gospel which separate the grace of Christ from repentance.

Footnotes

1 - "Pravitas," depravity.

Whereupon - Whence ὅθεν hothen. Since the proof of his being the Messiah, of his resurrection, and of his calling me to this work, was so clear and plain, I deemed it my duty to engage without delay in the work.
I was not disobedient - I was not incredulous or unbelieving; I yielded myself to the command, and at once obeyed. See Acts 9:6; compare Galatians 1:16.
Unto the heavenly vision - To the celestial appearance, or to the vision which appeared to me from heaven. I did not doubt that this splendid appearance Acts 26:13 was from heaven, and I did not refuse to obey the command of him who thus appeared to me. He knew it was the command of God his Saviour, and he gave evidence of repentance by yielding obedience to it at once.

I was not disobedient unto the heavenly vision - This, O Agrippa, was the cause of my conversion from my prejudices and mal-practices against the doctrine of Christ. The vision was from heaven; I received it as such, and began to preach the faith which I had before persecuted.

(6) Whereupon, O king Agrippa, I was not disobedient unto the heavenly vision:
(6) Paul alleges God to be author of the office of his apostleship, and that God's grace is a witness.

Whereupon, O King Agrippa,.... Having been favoured with this illustrious appearance of the Lord and with this declaration and commission from him:
I was not disobedient unto the heavenly vision; to Christ himself, who appeared from heaven in so much light and glory, and spoke unto him, and appointed him what he should be, and do, and declared what use he should be of: he did not disbelieve what Christ said, nor was he disobedient to the orders he gave, but immediately set about the work he called him to, without consulting flesh and blood; see Galatians 1:16.

Whereupon, O King Agrippa, I was not disobedient unto the heavenly vision--This musical and elevated strain, which carries the reader along with it, and doubtless did the hearers, bespeaks the lofty region of thought and feeling to which the apostle had risen while rehearsing his Master's communications to him from heaven.

I was not disobedient unto the heavenly vision. He could still have disobeyed. His will was free, but he could only act in good conscience by obeying Christ. He not only was baptized by Ananias in Damascus, but, after some preparation, he began to preach, first in Damascus (Acts 9:27), and then at Jerusalem, where he disputed against the Grecians (Acts 9:28-29). Just when he preached throughout the coasts of Judea we are not informed. Hackett thinks it was when he came up with help at the time of the famine (Acts 11:30).
That they should repent. He preached more than a theory; he preached a new life.

From that time - Having received power to obey, I was not disobedient - I did obey, I used that power, Galatians 1:16. So that even this grace whereby St Paul was influenced was not irresistible.