What could you let go of, for the sake of harmony?
For the vast majority of the time, I don’t really care enough to make fuss of much so this is a question that mostly doesn’t apply.
But…when there is that one thing that gets under my skin to the point where you will get an argument or told to just sort yourself out, then there will be no harmony whatsoever until you sort yourself out or admit you are wrong. If you get me to that point then don’t expect harmony (and if you can’t get me to that crazy banshee point, then I couldn’t give too hoots about whatever it is so leave me be).
Life is generally too short to be bothered by most things so I find it fairly harmonious in general.