It turns out there is a difference between knowing happiness and experiencing happiness. Let's say we are going to go on a nice holiday somewhere - we read about it in a brochure, we book it, we have a sense of happiness knowing that we are going to go on a nice holiday. There is happiness in this.
Then we go on holiday. If we are lucky, we arrive and it is better than we expected - the pool is nice, the hotel comfortable, the food is delicious and everything is generally good. Our plans have reached fruition and now we are deeply happy and contented. We might experience a sense of relaxation in this.
So then, we might break down everyday events into two categories - I know this is good, I feel this is good. It is interesting to compare the two experiences.