Well, a quote of the day means, "Quote." I did post it exactly as they wrote it and yes aware of the differences, but oh well.
The way I look at this as in most societies people do not really want to know if you are sick or happy, they are just asking to be sociable.
If the person says, "How are you?" and you start telling them about your urinary track infection and all the blood and puss from a very bad sexua| encounter, they will run and hide quick. So simply saying "Yes I am happy" is much easier.