Here is a Happy Father's Day wish to my father and all the Dad-readers (and Dads-to-be) of the blog.
My one-line summary of motherhood, as is well-documented, is that there is no stronger force in nature than a mother defending her young.
For fatherhood, I think my summary is that, aside from primal elements like hunger, nothing occupies a man's mind more than trying to live up to his father's example and legacy.
There are countless examples in history, sports, and film where a guy is driven to formidable heights, all predicated on just trying to make Dad proud. From Tiger Woods to Mozart, I'd say it is one of the motivating forces of civilization.
Personally, my father set the bar extremely high, and I'm grateful.