the proof of the pudding (is in the eating) in British English.
The windows to the soul. Your eyes communicate more than you may think -- and you canât always control everything they reveal. Body language experts tell how to read a personâs eyes to tell if theyâre happy to see you, disgusted, bored, stressed and even lying. Pupil size.
It is how someone looks when they are telling the truth. When you want to better read a personâs emotions or spot when they lie, you will need to find their baseline, or notice how they look, sound, act and behave when they are telling the truth. To do this you want to discuss neutral topics.