I understand for a new believer it can be hard but for a salted believer should not have that much difficulty once they have a steady faithful relationship with The Holy Spirit the one that will teach you all that Jesus has said.
It is most likely from observations of reality that not everyone is taught identically. They may land on opposing positions. They may not be taught at all. How might we perceive why this is? We can, on the surface, claim that it's the fault of the people engaging, which is the common way. But there are other factors.
John 16:13 Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.
14 He shall glorify me: for he shall receive of mine, and shall shew it unto you.
Being brought into "all truth" if we thought about it, would or should mean we are brought into Jesus, completed. I think that happens. But maybe not entirely in this present life, obviously. All truth entails a subset truth for us all currently, that we see/know/hear only in part and as through a glass, darkly. I might even see that any claimant to truth should have this dictate securely fashioned to themselves, particularly in teaching or being taught. I automatically distrust any claimant that says they have "it all" and know "all things" for example. And there are plenty of same. In actuality such claimants would be dishonest by my sight. Christian sects tend to think they are the only sects that have the whole package deal. I don't think that is the case and can't be the case. Such claims have served serious divisions.
1 Corinthians 13:12
For now
we see through a glass,
darkly; but then face to face: now I
know in part; but then shall I know even as also I am known.
Let's go further. IF we are seeking "all truth" which we do seek "in Him" because Jesus Is Truth Himself, do we really want to know all things? For example, what if we did know all things, do any of us really want to know, oh, all thoughts of all people? I personally DO NOT want that level of truth nor do I see a need for it, nor do I in my current state have the capacity to even deal with such a matter. Think about what "all things" consist of. We'd very shortly find the amount of information/data and all the things that come with that completely overwhelming. It would seriously short circuit us in our current state.
1John 2:27 But the anointing which ye have received of him abideth in you, and ye need not that any man teach you: but as the same anointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in him.
There is a very basic lesson, quickly learned in simple contemplation of our Lord:
Matthew 10:24
The disciple is not above his master, nor the servant above his lord.
So we have a couple of basic touchstones.
A. We don't know all things and we see darkly.
B. We are factually in a position of subservience.
Employing reasoning to position B above it could be considered as being in a position
of factual subjectivity. I expect that will be our eternal disposition. I personally have no desire to be God, nor do I think that is even possible.
To understand our reality is to understand we are "subjects" planted in "subjectivity." If we are to come to know all things, we know all things vicariously, through God in Christ, as we have need to know or use to know for His Sole Purposes. IF believers don't know, we perhaps are not meant to know.
There is another approach to the above, altogether. Knowledge itself really is NOT the basis of Gods Matters in instruction. God deals primarily and really is only interested in the Eternal Matters. These are not and can not necessarily be hinged to "knowledge."
Paul for example tells us this about a number of matters, and pales them all in comparison to a far far greater matter. If we want to know about God,
this is perhaps the only direction available, necessary, and ACCESSIBLE to "all" believers.
1 Corinthians 13
1 If I speak in the tongues of men or of angels, but do not have love,
I am only a resounding
gong or
a clanging cymbal.
2 If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have a faith that can move mountains, but do not have love,
I am nothing.
3 If I give all I possess to the poor and give over my body to hardship that I may boast, but do not have love,
I gain nothing.
4 Love is patient, love is kind. It does not envy, it does not boast, it is not proud.
5 It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs.
6 Love does not delight in evil but rejoices with the truth.
7 It always protects, always trusts, always hopes, always perseveres.
8
Love never fails. But where there are prophecies, they will cease; where there are tongues, they will be stilled;
where there is knowledge, it will pass away.
Paul simplified this even moreso, here:
Galatians 5:6
For in Christ Jesus neither circumcision nor uncircumcision has any value.
The only thing that counts is faith expressing itself through love.
Without LOVE, all knowledge is worthless, and faith is vain and self serving babble.
We could lay up the dictates of LOVE above, and find every last sect and every last believer completely lacking following Him in those ways and in many cases, not even a believer whatsoever.
It's very hard to find believers, almost impossible in fact, who "really" believe that LOVE NEVER FAILS or that "LOVE does not keep record of wrongs" or LOVE that does not "count sins against people." (2 Cor. 5:19)
These and many more is why the churches are weak and are failures, divided, bickering, in strife, judgmental continually. They don't and can't seem to even focus on what really matters.
And fully deserving so.
So, the question of every day is, WHY? And this, God Himself will teach, if we are led in Love, by Love. They will see HOW to walk that way. How to deploy judgment as a matter of practical function. And "how to perform" what God in Christ has called us into.
No man can teach or give unto another,
what only GOD in CHRIST has to give to begin with. It is also almost instantaneously obvious who does NOT walk in His Ways, if we see His Measures.