Another person’s world is like a black box to us. All we have to go on are things outside of that black box—the words they say, their facial expressions and body language, their actions, our past history with them, their physical appearance, the tone and quality of their voice, and so on.
Before we go much further in our book, it’s worth acknowledging this undeniable fact—human beings are complex, living, changing organisms whose inner experience is essentially closed off inside of them. Though some might make claims otherwise, nobody can really state with any certainty that they know who somebody is completely.
Reading people's mind can make you valid