The Law found more than it lost when Christ said, โLove your enemies and pray for those who persecute you, so that you may be sons of your Father who is in heavenโ (Matthew 5:44-45). This most important commandment summarizes in a word the universal discipline of patience, since it does not allow us to do evil even to people who deserve it.
TertullianBut now inquiry is being made concerning these issues. First, can any believer enlist in the military? Second, can any soldier, even those of the rank and file or lesser grades who neither engage in pagan sacrifices nor capital punishment, be admitted into the church? No on both counts.
Tertullian