We can’t prove Must.  We can’t point to it, or define where it stops and starts, because it’s not a thing that we can see.  But we know that it exists because when it’s near, we feel it in our gut, it begs for a second glance, pulls us into another dimension, a space out of time where a day can pass in a moment.*
Elle Luna

*Elle Luna’s The Crossroads of Should and Must.