כַּ֭מַּיִם הַפָּנִ֣ים לַפָּנִ֑ים כֵּ֤ן לֵֽב־הָ֝אָדָ֗ם לָאָדָֽם׃
Seperti air memantulkan wajah kepada wajah, demikianlah hati manusia kepada manusia.
Rashi
is the heart of a man to a man his friend. According to how much a man knows that his friend loves him, so he will show him his face.