Originally Posted by DNA-1842
Guinan was "A Listener" and thus extremely perceptive, often seeing the things that the person she is helping could never see.
Troi relies entirely on being able to know exactly what is on the mind of her subject, and I remember one episode where she lost her telepathy, and was completely and utterly useless - falling back on generic stuff that she had been taught in classes, and eventually falling upon a solution by complete chance!
Guinan says she's just a listener but there is more then that going on. I recall the episode "Yesterday's Enterprise" when the Enterprise C changes the timeline. Guinan senses that something has changed = she intuits that Yar doesn't belong there. That's more than just hearing something someone says.