"..[My friend Marco said]. essentially, humans are alive for the purpose of journey, a kind of three-act structure. They are born and spend several years discovering themselves and the world, then plod through a long middle in which they are compelled to search for a mate and reproduce and also create stability out of natural instability and then they find themselves at an ending that seems to be designed for reflection. At the end, their bodies are slower, they are not as easily distracted, they do less work, and they think and feel about a life lived rather than look forward to a life getting started. He didn't know what the point of the journey was, but he did believe we were designed to search for and find something. And he wondered out loud if the point wasn't the search but the transformation the search creates. ...[I wondered] that we were designed to live through something rather than to attain something, and the thing we were meant to live through was designed to change us. The point of a story is the character arc, the change."
--Donald Miller, A Million Miles in a Thousand Years: What I Learned While Editing My Life