I think the logical basis comes from saying we are in the 'church age' so only the writings of Paul about the rules for this age are 'directly relevant'. Other parts of the bible obviously help us to read the writings of Paul correctly.

See the table in this link for a summary of the different ages: http://en.wikipedia.org/wiki/Dispensationalism

The logic is:

1. 'the fall'= we thought we could do it all ourselves
2. 'the law' = a way to live that would bring blessings upon God's people (but with only a few like Moses, Joshua and David being filled with God's spirit)
3. 'pentecost' = through the actions of Jesus we are all able to be filled with Gods spirit and walk humbly in the spirit to do God's work.

As we are in the 'Church Age' and able to be filled with the God's spirit some people say Paul's writings argue there are no rules except that we walk humbly in the spirit seeking to do God's will. However, Paul's writings would also suggest we need to work at this and be subject to church discipline when we start failing to show the fruits of the spirit (depending on the church this might be through greed, sexual immorality, envy, gossip etc as shown in Paul's writings to various churches he had helped establish).

I think I would be with most Christians in thinking that all the books of the Bible have been recognised as being written by people with -at the very least- some great wisdom and understanding of the nature of God. However, logically speaking, some books are more directly relevant to our present lives than others.

I think the logical basis comes from saying we are in the 'church age' so only the writings of Paul about the rules for this age are 'directly relevant'. Other parts of the bible obviously help us to read the writings of Paul correctly.

See the table in this link for a summary of the different ages: http://en.wikipedia.org/wiki/Dispensationalism

The logic is:

1. 'the fall'= we thought we could do it all ourselves
2. 'the law' = a way to live that would bring blessings upon God's people (but with only a few like Moses, Joshua and David being filled with God's spirit)
3. 'pentecost' = through the actions of Jesus we are all able to be filled with Gods spirit and walk humbly in the spirit to do God's work.

As we are in the 'Church Age' and able to be filled with the God's spirit some people say Paul's writings argue there are no rules except that we walk humbly in the spirit seeking to do God's will. (eg. St Augustine saying 'love God and do what you please'). However, Paul's writings would also suggest we need to work at this and be subject to church discipline when we start failing to show the fruits of the spirit (depending on the church this might be through greed, sexual immorality, envy, gossip etc as shown in Paul's writings to various churches he had helped establish). Today, liberal churches tend to focus more on whether churches are showing the fruits of the spirit without strict rules whereas more fundamentalist churches tend to focus on specific issues of church discipline Paul noted with churches of his time and apply the same rules to their own church.

The above logic based on dispensationalism can be supplemented with the amillennial or postmillennial views. That is, through Jesus actions each of us can accept growth in the holy spirit - and can therefore participate in the growth of God's Kingdom here and now on earth (John 12:31-32). According to Amillennialists, the church age is simply the Kingdom of God on earth, lived out by His followers (http://www.whatchristianswanttoknow.com/what-is-the-church-age/#ixzz3bQGHv7ci).