In "God's Word for Today" Gordon Snider writes:

Most people would agree that broken relationships are a huge problem in today's world. The divorce rate supports this statement, as does the increasing tendency to resort to violence against others. Divided churches and families are also stark reminders that Christians need to pay a lot more attention to relationships. As important as believing the correct truths is, the defining mark of the New Testament Christians, according to John 13:35, was their love for each other. So what is wrong? Why are Christians today even dealing with such troubled relationships? The central truth of today's lesson proposes an answer to that question. “Proper relationships with others begin with a proper relationship with God.”

Source: Building Christian Relationships: Adult Teacher's Insights, page 10.