Harmony means conflict is still alive.
Harmony means the conflicting parts are there but they are no longer conflicting.
The real harmony is when the conflicting parts have dissolved into one unity.
But then you cannot call it harmony, because harmony needs many, harmony means that there are many fragments in a harmonious whole.
The real harmony is when those many are no longer there; they have become one.
So a harmony, a real harmony, cannot even be called harmony. The real harmony is simple unity. There is no conflict and no friction, because all the fragmentary parts have disappeared, dissolved.