The point I am wanting to share is that when it comes to agreement, it is easier said than done. We don't even need the devil to get involved to disagree we do a pretty good job in our own human nature. Yet God tells us in His word there is power in agreement.
It took my husband and I two years to decide on a couch. Two years. Many times I wanted to just throw in the towel and say, "Just get what ever you want." On the other hand I had done that in my marriage in the past and then had to live for years with things I didn't like. This time I was older and wiser and was willing to hold out as long as needed until we found something we could agree on.
The funny thing to me is once we agreed on that we have recently made three more major decisions and they were all made within a matter of minutes. What was the difference? I believe that we won the battle with the devil concerning getting us over into strife. Now I realize there is still a war but we won a few battles and we will continue to fight.