In Matthew 16, Peter got a revelation of who Jesus really was - the Christ, the Son of the living God, then immediately got a revelation of what Jesus wasn't meant to do. Peter had just received knowledge directly from the Father, then received false knowledge directly from Satan. Peter shared truth, then a lie. Out of the same mouth came fresh water and bitter. Why? How could this have happened?

Jesus responded to his first revelation with this amazing prophecy- "BLESSED ARE YOU, SIMON BAR-JONA: FOR FLESH AND BLOOD HATH NOT REVEALED IT TO YOU, BUT MY FATHER WHICH IS IN HEAVEN. AND I SAY ALSO UNTO YOU, THAT YOU ARE PETER, AND UPON THIS ROCK I WILL BUILD MY CHURCH, AND THE GATES OF HELL SHALL NOT PREVAIL AGAINST IT. AND I WILL GIVE TO YOU THE KEYS OF THE KINGDOM OF HEAVEN: AND WHATSOEVER YOU BIND ON EARTH SHALL BE BOUND IN HEAVEN: AND WHATSOEVER YOU LOOSE ON EARTH SHALL BE LOOSED IN HEAVEN".

I believe there was some fleshly competition among the apostles "And there was also a strife among them, which of them should be accounted the greatest", i think when Peter was commended by and so highly spoken of by Jesus,  i think Peter got the big head. I think he got prideful and perhaps a bit arrogant,  and i think pride opens the door for Satan to influence us. Satan's kingdom is built on pride. God's is built on humility. Jesus rebuked them (and us) for trying to be the greatest (in man's eyes). "The kings (pastors) of the gentiles excersise lordship over them: and they that excersise authority upon them are called benefactors" - people today bless their pastors (or any leadership) with praise and money and willingly become subservient to them - but Jesus warned us "you shall not be so: but HE THAT IS GREATEST AMONG YOU, LET HIM BE AS THE YOUNGER;  AND HE THAT IS CHIEF, AS HE THAT DOTH SERVE "  - these are not just idle words Jesus is speaking, this is not just a nice philosophy to admire from a distance- this is the key to godly, Christ-like leadership in the Body today.

To "be as the younger" means we don't go around telling everyone else what to do, even what to believe: we don't make them follow us, no, we teach them by example how to be our Father's little children- totally dependant on Him, wholeheartedly in love with Him. We show people our constant reliance on our daddy - for sustenance,  for direction and purpose-  if God uses us at all, it should humble us further, not make us prideful,  "for pride goeth before destruction and a haughty spirit before a fall", sure enough, when Peter got puffed up in pride, Satan's spirit accosted him and he did what Satan did in heaven, and what he did in the garden, and what he wants all mankind to do - he rebuked Jesus! To his face! He told Jesus he was wrong. 

Today, this same spirit permeates denominations and churches and it influeces the whole world -  all daring to rebuke God, to contradict Him, to change the truth of God's word into a lie. 

Pride seems to have been a temptation for Peter throughout his life -  Paul actually rebuked him at one point "but when Peter was come to Antioch, I withstood him to the face, because he was to be blamed for before that certain came from James, he did eat with the gentiles (as the Holy Spirit instructed him to do,  when he sent him to Cornelius' house) but when they were come, he withdrew and separated himself-  fearing (respecting) them that were of the circumcision". 

God is no respecter of persons, neither should we be. Our flesh is constantly looking for any excuse to exalt ourselves over our brethren  - "I have a four year degree from a Bible college", "I've stayed in your church and served you faithfully all these years", "I'm anointed", "I can prophecy", "i give large offerings". Churches compete with each other for influence and souls. All because of pride. Some look down on others because of their skin color. Some belittle others because of their gender. Married couples think they're better than singles. Each denomination thinks it's better than the rest. FLESH! FLESH! FLESH! "Vanity of vanities, saith the Preacher, vanity of vanities; all is vanity". 

The key to maintaining our heart's humility is to focus our hearts on Him, not on ourselves. Both the Song of Solomon and the book of Revelation end with this plea -  the passionate cry of the heart "Make haste, my beloved! Even so, come, Lord Jesus!"

Just as Peter tried to correct Jesus -  so to, do many in leadership today try to bring correction to the Holy Spirit. In countless churches, on countless tongues,  their doctrine is the opposite of what the Holy Spirit teaches. They fall quickly into error when they do not receive the Holy Spirit's instruction "Turn you at my reproof: behold, I will pour out my Spirit upon you. I will make known my words unto you. Lean not unto your own understanding. Be not wise in your own eyes (or in the eyes of men)".

So many attend a Bible School in order to be counted wise by men; not realizing  wisdom is a spirit, and only knowledge imparted spirit to spirit can make us wise. It cannot be learned from a book , if the Holy Spirit is not present, it cannot be learned from men, mind to mind. People who do not learn from the Spirit are ever learning but never arriving at the knowledge of the Truth -  we can go to Bible school,  we can sit in a pew our entire lives, and feel really good about ourselves for doing it, and never know the truth, Jesus himself.  Wisdom is a spirit "making mention of you in my prayers, that the God of our Lord Jesus Christ, the Father of glory, may give unto you the spirit of wisdom  and revelation in the knowledge of Him". 

When Jesus praised Peter, and told him "upon this rock I will build My church" He was alluding to Apostolic and Prophetic revelation -  for we are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief cornerstone, in whom all the building fitly joined together groweth unto a holy temple in the Lord, in whom you also are builded together for an holy habitation of God through the Spirit".

We are meant by God to house the Holy Spirit.  Jesus,  as an infant, found no room in the Inn, but we, as infants, have found room in Heaven, that we may now be houses of the Holy Spirit. Without Him, we can understand,  and do, nothing. "He that abideth in Me, and I in him, the same bringeth forth much fruit; for without Me you can do nothing."

So to summarize  - false doctrines,  doctrines of men and devils, enter in to our thinking when we become  arrogant enough to tell the Holy Spirit what is correct and what isn't.  What is true and what is not. Eventually,  though long-suffering, the Holy Spirit will cease altogether trying to teach truth to such people. Then more and more darkness enters in - till  their entire denomination dies.