I found this psalm last week while reading. It struck a chord immediately! Did you notice the exclamation point???? David was really making the point! And, how this psalm resonates with me as a mother.
How GOOD and PLEASANT our home is when brothers (and sisters) are living in unity.
And....how UNPLEASANT our home is when there is strife.
David was no stranger to family strife. His sons fought with each other, killed one another, and tried to kill him! So...I can feel his passion when speaking about peace. I haven't studied the history of the psalm (although it is included in the "songs of ascents"), but I wonder if David wrote this when it was a peaceful, unified time within his family...