Peter was used to show Jesus' Divine Principle of understanding the construction of MANKIND as it pertains to our present flesh.
Rather than cite the entire scriptural chain regarding Peter, let's just look first at WHO will "build His Church."
Matthew 16:18
And I say also unto thee, That thou art Peter, and upon this rock
I will build
my church
What? What happened to Peter in this equation? Obviously it is JESUS who "builds" His church.
So what does PETER show us in this scriptural chain???
If you follow the very next action of Peter, this is what you SHOULD observe and find UNDERSTANDING OF THE KEY.....:
22 Then Peter took him, and began to rebuke him, saying, Be it far from thee, Lord: this shall not be unto thee.
23 But he turned, and said unto Peter,
Get thee behind me, Satan: thou art an offence unto me
Ahhh....now we see the CONDITION of Peter don't we? SUBJECT TO SATAN...
There is a voice in PETER that Jesus will agree and uphold IN TRUTH and AGREEMENT with "His Word" as Jesus showed earlier with Peter and his most accurate depiction of Jesus as The Christ, The Son of God.
And there is the VOICE of OPPOSITION that is ALSO in Peter, the VOICE OF SATAN speaking from Peter's flesh and MIND.
Bingo...you just got a KEY.
Satan is RESISTED by Jesus IN Peter.
Let's look at another application of this fact. GO TO THE CROSS. One thief (FINALLY) spoke in agreement with Jesus, and was RECOGNIZED.
The other thief DIDN'T. That man remained BOUND by a liar and Jesus does not RECOGNIZE that one which is IN MANKIND. This does not mean that the slave who DID NOT SPEAK right was condemned, but the SLAVEMASTER upon that man was not recognized, as Jesus does not KNOW them...the resistance movement, THE DEVIL AND HIS MESSENGERS.
Another application to this "key" get's real PERSONAL.
NONE can say they have no sin, or that they have not sinned, and those who do commit sin are....drumroll....OF THE DEVIL.
Now you can take the same thing that happened here in Matthew 16 and take it to YOURSELF. Yes, our flesh and minds are subjected to THE DEVIL, to SATAN...and when the "works" of the workers of iniquity transpire in the flesh, you are THEIR SLAVES.
enjoy your new KEY. This understanding WILL unlock the scriptures in YOUR behalf, and it will LOCK the gate of heaven permanently to your opposers who are in the flesh of ALL mankind.
Divide in this way with your new KEY and you "should" be able to LOVE all of your fellow man, and UNDERSTAND when "something else" speaks from them.
Jesus divided this way nearly continually in the Gospels, and He will do so AGAIN. That is HOW He builds His Church and the gates of HELL will not prevail against HIM.
squint