Why do Christians call each other “brothers and sisters”?

In many New Testament letters, the readers are addressed as “brothers”. See for example Romans 1:13, 1 Corinthians 1:10, Galatians 1:11 and 2 Peter 1:10. In the book of Acts, we read that this was already common practice among the apostles and in the early years of the church (e.g. Acts 15:3, Acts 15:23). Some … Meer lezen over Why do Christians call each other “brothers and sisters”?