Not all Christ's Apostles were uneducated. Apostle Luke was a medical doctor. Apostle Paul was a Bible scholar trained under the best Hebrew scholar of his day, Gamaliel. Christ would choose Paul to write the majority of The New Testament Books. So that ends any potential 'hate knowledge and study' slander that some in the Church today have gotten from false prophets who want to keep God's people dumbed down, especially within His Word.
God's Word also covers the "various reasons" subject of false ones creeping into God's Church, in both The Old and New Testament Books. Only those of Faith in Christ that realize true Bible study line upon line is how God wants us to be in His Word, would realize that. Those in the Church that have had a long time to study that matter have no excuse in not knowing about it.
The example of a New Testament Apostle of Christ Jesus is mainly about those whom He chose at the beginning of His Ministry that also witnessed His crucifixion and resurrection. Apostle Paul was chosen later, and directed 'personally' by Christ Jesus. Barnabus and Timothy were chosen via The Holy Spirit through Christ's Apostles.
The 'idea' of an apostle per New Testament doctrine simply means one that is 'sent' by Christ, for to be sent is the Greek meaning of the word apostello (Strong's no.649; see John 17 also).
Does that idea of being chosen by Christ and 'sent' always mean an Apostle in the office of leadership over His Church like His original 12, and Paul? No, it can also be applied to any one of His chosen elect that He sent into this world for His Purpose of The Gospel...
John 9:1-10:12
1 And as Jesus passed by, He saw a man which was blind from his birth.
2 And His disciples asked Him, saying, "Master, who did sin, this man, or his parents, that he was born blind?"
A specific idea they ask Him there is one of the doctrines some of the Jews had then from ancient paganism (and is still prevailent among some groups of Jews still today). When they asked Christ if it was the blind man's sin that caused him to be born blind, that is the idea of sin from a previous life, which is the eastern doctrine of reincarnation (i.e. many births of the soul).
John 9:3 Jesus answered, "Neither hath this man sinned, nor his parents: but that the works of God should be made manifest in him.
4 I must work the works of Him That sent Me, while it is day: the night cometh, when no man can work.
5 As long as I am in the world, I am the light of the world."
Jesus answers that the man was born blind from birth so that God's Works would be manifest. But how could that be about God's Works? You'll find out how if you continue this Chapter line upon line. Notice our Lord Jesus brings up the subject of 'being sent' within that.
John 9:6 When He had thus spoken, He spat on the ground, and made clay of the spittle, and He anointed the eyes of the blind man with the clay,
7 And said unto him, "Go, wash in the pool of Siloam, (which is by interpretation, Sent.) He went his way therefore, and washed, and came seeing."
Christ sent the blind man to the pool called Siloam which means "Sent". There the blind man was to wash the clay off his eyes. There's a second reference to the idea of one being 'sent' for God's Purpose.
John 9:8 The neighbours therefore, and they which before had seen him that he was blind, said, "Is not this he that sat and begged?"
9 Some said, "This is he": others said, "He is like him": but he said, "I am he."
10 Therefore said they unto him, "How were thine eyes opened?"
11 He answered and said, "A man that is called Jesus made clay, and anointed mine eyes, and said unto me, 'Go to the pool of Siloam, and wash': and I went and washed, and I received sight."
12 Then said they unto him, "Where is he?" He said, "I know not."
13 They brought to the Pharisees him that aforetime was blind.
Here's another repeat of the 'sent' idea, a third reference so far. The man's neighbors marveled and wondered. And what did the blind man do? He WITNESSED Christ Jesus to them. Doing that was a work in service of The Gospel, because the OT prophecy about Christ's coming included these kind of signs of miracles.
Because at that time the people referred all matters of a religious or spiritual nature to the priests and Pharisees, they then 'brought' the man to the Pharisees for questioning.
John 9:14 And it was the sabbath day when Jesus made the clay, and opened his eyes.
15 Then again the Pharisees also asked him how he had received his sight. He said unto them, "He put clay upon mine eyes, and I washed, and do see."
16 Therefore said some of the Pharisees, "This man is not of God, because he keepeth not the sabbath day." Others said, "How can a man that is a sinner do such miracles?" And there was a division among them.
The Pharisees then asked the man that was blind how he was healed. And what happens? He that was born blind and healed by Christ then WITNESSES The Gospel to those Pharisees. When the Pharisees recognized Jesus' involvement in the matter, they questioned how Jesus could do that, since they believed our Lord Jesus was not of God. And because others among them recognized the miracle, the Pharisees were divided over the matter.
The man blind from birth was SENT to the unbelieving Pharisees to give a Testimony and Witness of Christ Jesus, right among a nest that included unbelievers who sought to kill Jesus. Christ gave this type parallel in Mark 13 also for His elect that are to be delivered up to councils and synagogues to given a Testimony for Him against the false ones, and it's for the end of days prior to His return. So several Scripture events and prophecy are being linked together here with this man that was blind whom Christ sent.
John 9:17 They say unto the blind man again, "What sayest thou of Him, that He hath opened thine eyes?" He said, "He is a prophet."
18 But the Jews did not believe concerning him, that he had been blind, and received his sight, until they called the parents of him that had received his sight.
19 And they asked them, saying, "Is this your son, who ye say was born blind? how then doth he now see?"
20 His parents answered them and said, "We know that this is our son, and that he was born blind:
21 But by what means he now seeth, we know not; or who hath opened his eyes, we know not: he is of age; ask him: he shall speak for himself."
Notice those Pharisees still refused to believe the man that was blind, and instead believed the man had never been blind in the first place. They thought it a hoax. His parents testify that he was born blind, and the Pharisee's dilema of unbelief goes deeper. I like their final answer to them, that their son is an adult, ask him, not us, thus forcing the Pharisees to turn back to the Testimony of the man that was blind, which Christ 'sent'.
John 9:22 These words spake his parents, because they feared the Jews: for the Jews had agreed already, that if any man did confess that He was Christ, he should be put out of the synagogue.
23 Therefore said his parents, "He is of age; ask him."
Note the Pharisees were just waiting... for one of them to speak that Jesus is The Christ of the Old Testament prophecies. And they had planned beforehand to throw out anyone that proclaimed that. This is an important marker showing these Pharisees were false from the get-go. They had NO intention of allowing anyone to disrupt their little playpen they had established for themselves over God's people.
Those Pharisees being well studied in the OT Books and God's prophets, there is no way they could have missed the prophecy of Messiah coming to work miracles like this as a witness of Christ (Isa.35:4-6; Ps.146:8; Isa.42:7; Isa.7; Isa.9; Micah 5; Zech.9:9-10). That is another revelation they were not following God's Word, nor had intention to follow God's Word. If they had believed what God told His prophets about Christ, including what Moses said (Deut.18:15-18), they would have believed Jesus is The Christ of OT prophecy.
John 9:24 Then again called they the man that was blind, and said unto him, "Give God the praise: we know that this man is a sinner."
25 He answered and said, "Whether He be a sinner or no, I know not: one thing I know, that, whereas I was blind, now I see."
Now those Pharisees tried to get the man that was blind to change... his Testimony, falsely claiming they knew that our Lord Jesus was a sinner. The blind man refused to change what he said, and gave his Witness of and for Christ Jesus once again.
Do you 'see' how this event is a type parallel for those of Christ's elect that are to be delivered up to these types of men in the last days, to give His Testimony? If you think you might be one of His elect, then this is an account of what kind of questioning to expect.
John 9:26 Then said they to him again, "What did He to thee? how opened He thine eyes?"
27 He answered them, "I have told you already, and ye did not hear: wherefore would ye hear it again? will ye also be His disciples?"
28 Then they reviled him, and said, "Thou art His disciple; but we are Moses' disciples.
29 We know that God spake unto Moses: as for this fellow, we know not from whence He is."
Now those Pharisees ask just what Jesus did to relieve the man's blindness. The man kind of begins to scold them, having already told the Pharisees, then asks them if they would become Christ's disciples as a reason why they kept asking him. What these scripture lawyers of the Pharisees are trying to do is get the man to keep repeating his story in hopes to catch him tripping up, just so they can wrongly paste a lie onto his Testimony for Christ. So there's another marker for what to expect for some of Christ's elect in our near future with dealing with those types.
What's the Pharisee's next recourse? They begin to lie and say that man that was blind is actually one of Christ's disciples, like he came planting his story in order to push the teachings of Jesus Whom they wanted to execute. Then what do they lie about next? They begin claiming to be "Mose's disciples". If you read what Moses said in Deut.18:15-18, then what are those Pharisees doing? They're lying through their teeth. If they were truly Moses' disciples they would have listened... to Moses in that Deut.18 Scripture and thus recognized Jesus as that "Prophet" Moses spoke about that was to come.
So we're given several pointers here how these Pharisees were not followers of God and Moses, but only play-acting as if... they were.
John 9:30 The man answered and said unto them, "Why herein is a marvellous thing, that ye know not from whence He is, and yet He hath opened mine eyes.
31 Now we know that God heareth not sinners: but if any man be a worshipper of God, and doeth His will, him He heareth.
32 Since the world began was it not heard that any man opened the eyes of one that was born blind.
33 If this man were not of God, He could do nothing."
Man, is what that man that was blind is speaking by The Holy Spirit or what!
John 9:34 They answered and said unto him, "Thou wast altogether born in sins, and dost thou teach us?" And they cast him out.
35 Jesus heard that they had cast him out; and when He had found him, He said unto him, "Dost thou believe on the Son of God?"
36 He answered and said, "Who is He, Lord, that I might believe on Him?"
37 And Jesus said unto him, "Thou hast both seen Him, and it is He That talketh with thee."
38 And he said, "Lord, I believe." And he worshipped Him.
The Pharisees couldn't refute his Testimony for Christ, so they gave up their third-degree and cast the man out. Our Lord Jesus then revealed Himself to the man and the man believed and worshipped Him.
John 9:39 And Jesus said, For judgment I am come into this world, that they which see not might see; and that they which see might be made blind.
40 And some of the Pharisees which were with Him heard these words, and said unto Him, "Are we blind also?"
41 Jesus said unto them, "If ye were blind, ye should have no sin: but now ye say, 'We see'; therefore your sin remaineth."
Jesus came at His first coming to open up the eyes of the blind (both physically and spiritually). But those spiritually blinded by spiritual darkness because of refusing God's Word, He made those blind. Because those Pharisees claimed they could 'see' (spiritually) while claiming to follow God and His Word when they were not, Jesus told those they remained guilty in their sins, not forgiven. This is why it is very important to stay as close in God's Holy Writ as possible.
That's an example of the idea of a chosen sent one by Christ Jesus that prevents any man from trying to exalt himself into special authority of an Apostleship like Christ's Apostles of His first coming. All of God's elect today that are 'sent' into this world for duty in The Gospel are 'apostles' in this sense, and these are not few.