By experiencing loss I have learned that ‘taking things for granted’ does not work.
By contemplating all I have received, the things I love, I experience gratitude. I do not know if ‘happiness’ exists… whether happiness is something which comes and goes, or that it is something in which you can dwell for a longer period of time before it becomes ‘normal’. Gratitude however, is something one can cherish their whole life, one can experience it at any given moment, even with sorrow, or maybe especially when in pain. Maybe that is why I feel sadness- sometimes- in the presence of those things still with me? Music can be a big help, to get into that mood, in which appreciation for all those things can be felt.