Many of the one another commands are warm instructions that we are eager to obey, even if we find it difficult to do so. The command to forgive is one against which we sometimes bristle. We know we should obey it, but we don’t always want to. It’s not, strictly speaking, that we don’t like forgiveness; it is that we don’t like extending forgiveness. We want to be forgiven without necessarily forgiving others.
Building one another up is rooted in the gospel message—the hope of salvation we have in Christ Jesus. Paul exhorted the Thessalonian church to build one another up in the gospel, and through his letter to them he exhorts us to do the same.