Tsukumodo:Volume 2 Eyes of Death
The eyes are as eloquent as the tongue.
The proverb is used when the eyes reveal everything even when it's not put into words.
That said, it's naturally not so easy to read someone's mind just by looking into their eyes.
In by far the most cases, words are necessary to convey things, and we can't really read someone's thoughts off their eyes.
In the first place, not all people show their feelings in their eyes. Some of them don't even show them on their face.
My workmate is like that. She only alters her mien so slightly that it's impossible to tell whether she's happy or angry, and when someone gets to see her deadpan for the first time, he almost certainly shrinks back. But even though she's unable to even just put on a friendly smile, she feels a vocation to attend to customers. I have not the slightest idea what's going on in her head.
Although I feel that I'm slowly starting to get the knack of understanding her thoughts.
Or is that just me?