Anger is active sadness; sadness is inactive anger. They are not two things. Watch your own behaviour. When do you find yourself sad? You find yourself sad only in situations where you cannot be angry. The boss in the office says something and you cannot be angry; it is uneconomical. You cannot be angry and you have to go on smiling — then you become sad. The energy has become inactive. You come home, and with your wife you find a small thing, anything irrelevant, and you become angry.
People enjoy anger, they relish it, because at least they feel they are doing something. In sadness, you feel that something has been done to you. You have been at the passive end, at the receiving end. Something has been done to you and you were helpless and you could not retort, you could not retaliate, you could not react.
In anger, you feel a little good. After a big bout of anger, one feels a little relaxed… feels good. You are alive. You also can do things. Of course you cannot do to the boss, but you can do to the wife.
Then the wife waits for the children to come home — because it is uneconomical to be angry with the husband. The whole life seems to be economics. He is the boss, and the wife depends on him, and it is risky to be angry at him. She will wait for the children. They will come home from school, and then she can jump and she can beat them — for their own sake. And what will the children do? They will go in their rooms, they will throw their books, tear them, or beat their dolls, or beat their dogs, or torture their cats. They will have to do something. Everybody has to do something, otherwise one becomes sad.