“The heart changes the countenance,
Either for good or for evil.
The sign of a happy heart
Is a cheerful face.
Requires painful thinking.”
If you look at someone, you can tell whether they have a happy heart. The heart has an effect on how you look, whether for good or evil. A cheerful face is a sign of a happy heart. If you have a painful face, it may be than you are trying to formulate proverbs, like our friend Sirach. He may not have had a happy face.