When I thought about the times in my life when I was happy, I tend to agree with Thomas Merton. Yes indeed, those happy times represented times when there was balance, order, rhythm and harmony. Maybe I should also add here, that we also experience happiness when we are at peace.
Thomas Merton is a Trappist monk who wrote many books. I first encountered him when I read his book "The Seven Story Mountain." I love his deep insights about many things. You can read more about him here: http://en.wikipedia.org/wiki/Thomas_Merton