The thing we need is the holy spirit within our hearts to teach us the truth.
And the truth is to believe in the gospel and the teachings of Jesus Christ and all of his apostles, not just to believe in and listen to Paul.
Problem is...everyone...asserts your above assertion.
As some sort of an ignorance is bliss as their magic formula.
By ignorance, I mean unaware, or lacking in information as to how a thing actually works.
Be that unintentional ignorance, or the willful ignorance of those who right off prove what really matters to them when...a thing is pointed out to them...and the first thing out of their mouth is all about how they...have been personally offended.
Fact of the matter as to this issue?
There WAS this...
John 14:25 These things have I spoken unto you, being yet present with you. 14:26 But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
The result of that WAS this...
Matthew 10:16 Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves. 10:17 But beware of men: for they will deliver you up to the councils, and they will scourge you in their synagogues; 10:18 And ye shall be brought before governors and kings for my sake, for a testimony against them and the Gentiles. 10:19 But when they deliver you up, take no thought how or what ye shall speak: for it shall be given you in that same hour what ye shall speak. 10:20 For it is not ye that speak, but the Spirit of your Father which speaketh in you.
And the result of that WAS this...
Acts 4:1 And as they spake unto the people, the priests, and the captain of the temple, and the Sadducees, came upon them, 4:2 Being grieved that they taught the people, and preached through Jesus the resurrection from the dead. 4:3 And they laid hands on them, and put them in hold unto the next day: for it was now eventide.
Acts 4:7 And when they had set them in the midst, they asked, By what power, or by what name, have ye done this?
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Acts 4:8 Then Peter, filled with the Holy Ghost, said unto them, Ye rulers of the people, and elders of Israel,
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Acts 4:9 If we this day be examined of the good deed done to the impotent man, by what means he is made whole; 4:10 Be it known unto you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, even by him doth this man stand here before you whole. 4:11 This is the stone which was set at nought of you builders, which is become the head of the corner. 4:12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved. 4:13 Now when they saw the boldness of Peter and John, and perceived that they were unlearned and ignorant men, they marvelled; and they took knowledge of them, that they had been with Jesus. 4:14 And beholding the man which was healed standing with them, they could say nothing against it.
And WE know this because THERE IT IS in WRITTEN form FOR US to know OF.
Romans 10:17 So then faith cometh by hearing, and hearing by the word of God.
For even in light of the great supernatural things THEY had been privileged to have been FIRST HAND eyewitnesses of - one of THEM - Peter...pointed readers to the following, as his own days upon this Earth were coming to an end...
2 Peter 1:13 Yea, I think it meet, as long as I am in this tabernacle, to stir you up by putting you in remembrance; 1:14 Knowing that shortly I must put off this my tabernacle, even as our Lord Jesus Christ hath shewed me. 1:15 Moreover I will endeavour that ye may be able after my decease to have these things always in remembrance. 1:16 For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty. 1:17 For he received from God the Father honour and glory, when there came such a voice to him from the excellent glory, This is my beloved Son, in whom I am well pleased. 1:18 And this voice which came from heaven we heard, when we were with him in the holy mount. 1:19 We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: 1:20 Knowing this first, that no prophecy of the scripture is of any private interpretation. 1:21 For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
The Scripture ITSELF is NOW our teacher.
Meaning HOW we study It determines what conclusions we each arrive at.
And just as all the above is a principle made obvious by The Scripture; it is just as obvious that Scripture Itself is based on principles It is not only following...but that the Spirit Who inspired All Scripture expects the so called "Bible Based" student of Scripture to come to...through...time in the Scripture...attempting there to find out from It...just what Its' principles...are...as to the proper discernment of the Words of God...
Or as the writer of Hebrews put it...
Hebrews 5:11 Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing. 5:12 For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat. 5:13 For every one that useth milk is unskilful in the word of righteousness: for he is a babe. 5:14 But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.