If we say that the addressees of the Epistles are the only ones for whom their messages are intended, where does it stop? What part of the Bible is for "us" then?
It's all
for us. It's not all
to us or
about us.
In other words, we can all learn from the letters Paul wrote. We simply have to be careful how we apply what he wrote to specific people for specific reasons as general rules for the church today. Here's a perfect example:
{3} But I want you to understand that Christ is the head of every man, and the man is the head of a woman, and God is the head of Christ.
1 Corinthians 11:3 (NASB)
In the verse above, Paul is making a general statement about the order of authority. He then goes on to make a specific statement as to how this should apply in church to which he was writing:
{4} Every man who has
something on his head while praying or prophesying disgraces his head.
{5} But every woman who has her head uncovered while praying or prophesying disgraces her head, for she is one and the same as the woman whose head is shaved.
1 Corinthians 11:4-5 (NASB)
Today we see churches where men pray with baseball and cowboy hats on while women pray wearing no head cover at all and yet very few consider these things a disgrace, especially women praying with uncovered heads.
Clearly, Paul was using a general observation about authority to make a specific point about prayer to a given church at a given time: a point he didn't repeat in any other epistle (that I'm aware of.)
Yet at the same time to another church he's telling wives to submit to husbands and husbands to loves wives to illustrate how Christ loves His church and how we are to submit to His authority (Ephesians 5).
He then tells all in the church to "submit to one another."
The point of all this is that we need to learn how to apply the general lessons Paul teaches to the specific needs and problems of our daily lives and the modern church.
All for us. Not all to or about us.