Paul says in Romans 12:1-2 that the one who is in Christ is to present themselves as a living sacrifice by renewing the way they think about the world. This is in contrast to conforming to the way the world answers the big questions about life.
Early Christians encountered many ways in which their new found faith called into question the way the Greco-Roman world things. Although Paul will list many examples in Romans 12-15, there are many more issues which will come up as Christianity comes into contact with the world. It cannot be the case that Paul will cover ever potential issue which might arise as more Gentiles commit their lives to Christ. Some things may seem obvious to us. It seems remarkable someone might ask if a Christian is permitted go to a temple, share in a sacred meal and enjoy the company of prostitutes. The Greco-Roman worldview might not object to this behavior, but transforming the way one thinks about marriage and sexual unions will result in a different view.
But the good and perfect will of God may change in a given situation. For example: Should Christians serve in the Roman military? It may possible for someone to serve Rome without worshiping the gods of Rome (on the analogy of Daniel serving Babylon), but is service to the Roman military a proper career for the first century Christian? What about a soldier who converts Christianity, can he continue to serve?
This process of thinking about new ways in which God’s will applies to new situations is a function of the Spirit of God in every generation (one cold ask about serving in the army of a Christian king in the middle ages, or a Chinese Christian who must serve in the army by Chinese law, or an American Christian serving in the modern military. If killing is the issue, can a Christian serve as a police officer, or in an industry which supports the military industry?
Any number of medical ethical issues can be included here, since Christians in the twenty-first century are the first to think through beginning of life, quality of life and end of life issues in ways no other generation of the church needed to think.
These are all important questions which people with renewed minds much continually think through in any given context. When the believer is yielded to the Holy Spirit, the Spirit will continually renew our minds so that we think more clearly about important issues which go beyond the text of the Bible.
What are some other issues which perhaps have changed over the years for Christians with respect to God’s will?