Osho speaks on ‘Happiness’
There are no outside causes of happiness or unhappiness; these things are just excuses. By and by we come to realize that it is something inside us that goes on changing, that has nothing to do with outside circumstances.
How you feel is something inside you, a wheel that keeps on moving. Just watch it — and it is very beautiful, because in being aware of it, something has been attained. Now you understand that you are free from outside excuses, because nothing has happened on the outside and yet your mood has changed within a few minutes from happiness to unhappiness, or the other way around. This means that happiness and unhappiness are your moods and don’t depend on the outside. This is one of the most basic things to be realized, because then much can be done. The second thing to understand is that your moods depend on your unawareness. So just watch and become aware. If happiness is there, just watch it and don’t become identified with it. When unhappiness is there, again just watch. It is just like morning and evening. In the morning you watch and enjoy the rising sun. When the sun sets and darkness descends, that too you watch and enjoy.
Osho, Everyday Osho, Ch 25