I have lived large parts of my life in wonderful circumstances that I utterly failed to appreciate. Reasons to be happy were everywhere, but somehow I didn't connect with them. It was as though I was eating but couldn't taste the food. Finally, I've learned to celebrate the good while it's happening. I feel gratitude and praise today for what are sometimes such simple pleasures. I have learned that happiness is not determined by circumstances. Happiness is not what happens when everything goes the way you think it should go; happiness is what happens when you decide to be happy.
If you want to obtain the secrets of such wonderful techniques, drill yourself, harden yourself, undergo severe training, abandoned body and mind; follow this course for years and you will naturally reach the profoundest levels. To know if water is hot or cold you must taste it yourself.