You must be a remarkable person to know what the other person is thinking, what the other person is, by simply looking at them.
You must either be a great psychic to possess such detailed insight into a stranger's character or a seer who has read it all from the stranger's eyes.
You must be beyond brilliant to know what a person will do in a certain situation even when the person in question is still struggling with a decision.
You must be God.
You must indeed be.
God of Assumption, Presumption and Jumping to Conclusions.