Good Tears and Bad Tears: Eicha 2:11

(15) "My eyes are spent with tears (Lamentations 2:11)": Rabbi Eleazar said: "Lumps formed on the eye", tears of hardness, and tears of mustard, and tears of collyrium (eye salve), and tears of laughter are the most pleasant of all of them. Three kinds of tears are evil: tears of smoke, tears of weeping, and tears from the bathroom, and tears over an adult child are the worst of all. For example: A certain woman, her adult son died and she was weeping over him each night until lashes of her eyes fell out and she went to the doctor and he said to her "Put on mascara with my mascara and you will be healed."

"My heart is in tumult, my being (kevedi) melts away": for example: a certain man, his adult son died and he was weeping over him each night until his liver (kevedeh) collapsed, and he said: "My liver is heavy and has fallen under its weight because I am weeping over him and all of this does not matter".