What on Earth are you thinking?

There is no way for you to know what someone else is thinking. You can only guess what they might think about a particular situation. You can never actual know what exactly their thoughts on a subject are unless you ask them.
I find that I spend a lot of time trying to figure out what someone else might be thinking. I would save myself so much time if I just asked them, rather than attempting to speculate.

All it takes is a simple question, “What do you think?”