"MYSTERY"

The English word "mystery" is a transliteration of the Greek word musterion, which means a sacred secret.

Rather than write a new study on this topic, I will refer you instead to a complete explanation of it. Why repeat what has already been said, and that by a scholar with much greater qualifications and abilities than myself?
I will post more later on The Mystery and its meaning and application to our daily lives.
Read at this link:The Mystery
This is Appendix 193 From The Companion Bible by E. W. Bullinger
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I am greatly delighted that The Watchmen Group now houses the
complete list of appendices to this Study Bible.

The Companion Bible is currently in print, and is also available free online, although its sheer volume makes this latter seem rather impractical to use.
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E. W. Bullinger bio from Wikipedia.

The Pauline Paradigm

It would be fair to say that what we know as Christianity can be referred to as "Pauline" Christianity. Paul did write the largest part of New Testament, the source of Christian theology.
It is unfortunate that there are those who attempt to demean Pauline Christianity as not being "true" or the Christianity or Gospel that Jesus taught.

That this kind of thinking is wholly unacceptable is readily apparent from the fact that Paul's writing is indeed in the Bible. Its place and value therefore have been established by God.

Confusion has been created by not clearly understanding that the gospels of Jesus and Paul are not the same. The words of scripture are true and absolute, there cannot be any contradiction within them. Error is made in assuming that since the two gospels are different they must conflict or contradict each other.

People have been taught long enough to recognize the "Old" Testament and the "New" Testament as reflecting different covenants or dispensations while remaining without contradiction. The problem is that while acknowledging that difference they have not understood how to correctly distinguish them and their application. They thus confuse and intermix Old Testament and New Testament principles.

The Pauline Paradigm is the model of living resulting from the entirely new construct of life in the indwelling Spirit of Christ as experienced in the community of the Church. This is the "mystery" which was revealed to Paul.

According to 2 Timothy 3:16,17 this paradigm is sufficient to meet every need in living the Christian life.

The great need is to teach this paradigm in its pure form. What we know as Christianity today is a dysfunctional mixture of Judaism, secularism and some of the true life in Christ.

Ephesians 3:9

and to bring to light what is
the Dispensation of the Mystery
which for ages has been hidden in God
Who created all things;