the eyes are the windows to the soul
Proverb meaning that a person's true feelings or character can be seen through their eyes.
目は心の窓と言うように、彼の目は優しさで溢れていた。
As the saying goes, the eyes are the windows to the soul; his eyes were full of kindness.
A Japanese proverb that corresponds closely to the English saying 'the eyes are the windows to the soul.' The exact origin is uncertain, but it reflects a common cross-cultural metaphor.