What does a man build upon a foundation? Any guesses? It's not hard to know 'buildings' are built upon foundations. Do you agree with this? What do you propose are built on foundations? One needs not build truths on the foundation, for the foundation is Truth Itself. Let's look at some verses to see what is built.
Let's be clear. There are a lot of deceived believers out there who are building false doctrines upon the foundation of Christianity. Like limited atonement, irresistible grace, God chooses who will believe, true believers will persevere in the faith, and things like one can lose their salvation, etc.
Since it makes no sense to you that people are buildings which are built on foundations, let's see what we can find on the subject. Maybe you will be enlightened by the following verses.
Ephesians 2
19 Now, therefore, you are no longer strangers and foreigners, but fellow citizens with the saints and members of the household of God,
20
having been built on the foundation of the apostles and prophets, Jesus Christ Himself being the chief corner
stone,
Ephesians 2:22
in whom you also are being built together for a dwelling place of God in the Spirit.
1 Peter 2:5
you also, as living stones, are being built up a spiritual house,
I see you didn't include verse 9 from 1 Corinthians 3. I will give it here to show the context of this chapter.
For we are God’s fellow workers; you are God’s field, you are God’s building.
Paul tells the Corinthians they are
God's building. Amazing what you will learn from the Word, without any preconceived ideas.
Now we can go on with the rest of chapter 3, knowing what we learned from the previous verses.
Please explain how one builds people into a building. Can you do that? What does that even mean?
We know the type of construction that Paul lists: gold, silver, precious stones, and wood, hay, straw. What do these mean? Are these types of people? Please explain how these refer to people.
Instead, they represent 2 types of construction of God's building. One type is permanent (gold, silver, gems) while the other type is impermanent and doesn't last (wood, hay, straw).
The issue is not good vs bad works, or even good vs bad people. It seems much more likely that Paul is discussion permanent vs impermanent works. iow, time spent watching sports, hunting, fishing, golfing are not bad works, but they are not works with eternal value. Unless one is evangelizing during that time.
Paul is encouraging the Corinthians to do what has eternal value. The testing of one's works, per 2 Cor 5:10 (Bema) will determine whether the work had eternal value or not (3:14,15).
Those believers who spent time doing works with eternal value will be rewarded, while those believers who wasted their time doing works with no eternal value will lose out on rewards.
Since you think it is advanced Biblical truths, you can now lay aside this thinking, and believe what the Bible actually says. Or unless you can provide verses which confirm your belief.
Please answer my questions and provide explanations as to why the issue is people themselves and how the passage supports that.
In fact, every believer will be evaluated at the Bema (2 Cor 5:10) to determine their quality of life in the eternal kingdom.
But if you want to continue to think that somehow you're going to use people to make buildings, I guess that's your right.
Instead, Paul's point is that believers whose works have no eternal value will see those works burn up at the Bema. They didn't last.
Unless you can provide verses which state advanced Biblical truths are built on foundations, I'm afraid your human viewpoint is worthless.
Instead of human viewpoint, which IS worthless, I will cite more Scripture.
Heb 6:1-2 - 1 Therefore
leaving the elementary teaching about the Christ,
let us press on to maturity, not laying again a foundation of repentance from dead works and of faith toward God, 2 of instruction about washings and laying on of hands, and the resurrection of the dead and eternal judgment.
So, how does one leave the elementary teaching and press on to maturity?
And, note what has just preceded these verses:
5:11,12
11 Concerning him we have much to say, and it is hard to explain, since
you have become dull of hearing.
12 For though
by this time you ought to be teachers, you have need again for someone to teach you the elementary principles of the oracles of God, and you have come to need milk and not solid food.
These believers have retrogressed in their spiritual lives. They had not matured, or advanced in the faith. They even needed to be taught the basic elementary teachings of Christ all over again.
So, to answer your last question, the foundation involves the "elementary teachings of Christ". And from that foundation, believers are to advance and press on to maturity. That obviously involves learning advanced doctrines, which is what "you ought to be teachers" refers to. Advanced knowledge, not just the basics.
Teachers must know much more than just the basics in order to really be teachers.
I'm just sorry if all this is new to you and you weren't aware of any of this.
But the evangelical church is in sorry shape today, it seems. Lacking in knowledge across the whole spiritual spectrum.