Who knows what’s going on in someone else’s head? All you can do is ask.
Those you trust, and who trust you will tell you in the best way they can explain it.
Even then, they’ve tried to put into words the workings of the most complex structure and powerful computer in the known universe, and then you’ve tried to convert those words back into thoughts within yours.
It’s no wonder there’s so much misunderstanding, and the distrust, hurt and upset that causes: words are clumsy and imprecise – wholy inadequate for the task.
All we can do is try to understand how the other might interpret, process and think about things based on their knowledge and experiences. And we attempt that understanding from a vastly different starting point.
Basically, it’s a non-starter…
Sad really.