I'm not sure, and this one is a bit hard for me as I am trying to figure it out. Perhaps it is the journey of growth that is the fulfilment—both positive and negative emotions may be involved, but they are not the all-encompassing thing. Maybe this is what they mean when say it's not about the destination but the journey.

You could probably apply this to life too, and not worrying about your own inevitable death—but rather what happens between