Sense of Life:

An emotional equivalent of a worldview, developed through a process of emotional integration over a lifetime.

A Sense of Life is a kind of emotional summation over a lifetime. It takes your individual emotional reactions and combines them over time into a resulting emotional response to the world itself. It's not a simple emotional reaction to how you view the world. While you can explicitly adopt a philosophy that reflects a positive view of life and the world, your Sense of Life does not simply change to reflect the new view. If you've lived a life full of misery and self-doubt, the resulting emotion feeling of the world does not just go away.