“It is worth pointing out that feeling things (which usually means feeling them painfully) is at some level linked to the acquisition of knowledge.”

“Happiness” alone does not guarantee mental health and well-being. A tempering dose of disappointment- an occasional taste of frustration and learning that you do recover from it- goes a long way toward producing long-term contentment. Indeed the ability to ride out the bad times without feeling doomed is essential to survival. When happiness is not taken for granted, and when one is acquainted with its opposite it is more easily savored and has more lasting effects.”