A person's true nature is revealed through their eyes.

The eye is always caught by light, but shadows have more to say.
The eyes like sentinel occupy the highest place in the body.
The eyes of others our prisons; their thoughts our cages.
The face is a picture of the mind with the eyes as its interpreter.
The eyes see only what the mind is prepared to comprehend.
One sees clearly only with the heart. Anything essential is invisible to the eyes.