Stand up against official opposition

What should we do in face of official opposition? This is what we learn from Peter today.
When Peter was bearing witness to Jesus in the Temple after healing a lame man, he was arrested.
And as they were speaking to the people, the priests and the captain of the temple and the Sadducees came upon them,
annoyed because they were teaching the people and proclaiming in Jesus the resurrection from the dead.
And they arrested them and put them in custody until the morrow, for it was already evening (Acts 4:1-3).
Had Peter done anything wrong? Was it wrong to heal a lame man? No. Was it wrong for Peter to bear witness to the resurrection of Jesus? No. Who else would be better to do this job, if not Peter? Was it wrong to teach the people in the Temple about Jesus' resurrection? Probably yes because it was the Temple and Peter did not have the license to teach in the Temple. The Temple was a place to worship and to offer sacrifice. We read of the story of Jesus staying in the Temple for three days, discussing with teachers of the law. Therefore, teaching also took place in the Temple but I'm afraid that was confined to teachers of the law, not a Galilean fisherman. Among those who came to arrest Peter, there were Sadducees who were closely related to the priests. Therefore, Peter was arrested probably because he had intruded into the turf of the priests.
On the other hand, Luke recorded an interesting figure. When Peter delivered the first ever Christian message to the world, three thousand people joined the 120 followers of Jesus (Acts 2:41). In his second message, another two thousand people joined.
But many of those who heard the word believed; and the number of the men came to about five thousand (Acts 4:4).
No. The number 2000 was not quite right. Everyday in between, people joined.
(The believers) praising God and having favor with all the people. And the Lord added to their number day by day those who were being saved (Acts 2:47).
Therefore, we do not know for sure how many people joined because of this second message in the Temple. Anyway, five thousand souls in Jerusalem was a huge crowd that could not be ignored. According to a catechist handbook compiled by the Online School of Evangelization,
In Jesus’ time, the population of Jerusalem was about sixty thousands and there were six thousand Pharisees (e-Catechism pg. 151). We see, then, that Christians were an expanding movement to be reckoned with. No wonder the priests were keeping a watchful eye over their activities.
On the morrow their rulers and elders and scribes were gathered together in Jerusalem,
with Annas the high priest and Caiaphas and John and Alexander, and all who were of the high-priestly family (Acts 4:5-6).
Among these two verses, Pharisees were not mentioned. Therefore, this might not be a full Council like the one that condemned Jesus to death. No, the Christian movement had not yet threatened their authority, but not for long. Yet, it is interesting to notice that High Priests were drawn from the high-priestly family. Not only do we have the all too familiar names such as Annas and Caiaphas, but also John and Alexander. Never mind, the crucial point is Annas, not Caiaphas, was the High Priest at the moment. So, did the High Priest office change its incumbent annually (John 18:13)? Peter was asked how he healed the lame man. It was a simple enough question. But Peter made use of this opportunity to preach Jesus.
Then Peter, filled with the Holy Spirit, said to them, "Rulers of the people and elders,
if we are being examined today concerning a good deed done to a cripple, by what means this man has been healed,
be it known to you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom you crucified, whom God raised from the dead, by him this man is standing before you well.
This is the stone which was rejected by you builders, but which has become the head of the corner.
And there is salvation in no one else, for there is no other name under heaven given among men by which we must be saved." (Acts 4:8-12)
Not only was Peter eloquent, but also well-versed. He was able to paraphrase the Psalm! Alright, you might argue that this was a popular piece of prooftext Christian used for apologetic purposes. But Peter was bold enough to drive it deeper. Priesthood had been established for thousands of years since Aaron. Yet, other than rubbing psychological balm on the guilty conscience of the people, they had never witnessed any healings. But right in front of their eyes, a lame man was healed through conjuring up the name of the crucified Galilean carpenter. What else could the priests say? There is salvation in no one else! Not in Annas, not in Caiaphas.
Of course, had the institution not been wrong, Peter would not have been able to stand up against it. Therefore, you can stand firm when God is on your side.

Dear Lord, I praise You for Your holiness. Let us abide in You and stand firm in our ground to bear witness for You. Amen.

Appendix:
This is the stone which was rejected by you builders, but which has become the head of the corner.
οὗτός ἐστιν ὁ λίθος, ὁ ἐξουθενηθεὶς ὑφ' ὑμῶν τῶν οἰκοδόμων, ὁ γενόμενος εἰς κεφαλὴν γωνίας. (Acts 4:11)
λίθον, ὃν ἀπεδοκίμασαν οἱ οἰκοδομοῦντες, οὗτος ἐγενήθη εἰς κεφαλὴν γωνίας (Psalm 117:22 LXX, 118:22 MT).