There are many mysteries in this world. Some are silly, like how many licks does it take to get to the center of a Tootsie Roll Pop? Some are contentious, such as the creation/evolution debate—how did we get here? Some are more profound, such as does the soul exist and if so, where in the body and how?
To me, the greatest mystery of all is God’s Love. Why does He love us?! Seriously, you look around at all of the crap in this world, all of the ‘bad people,’ all of the evil actions, and my favorite, all of the profoundly stupid things we do, and there are times we are merely a pathetic colony of parasites on an otherwise interesting mudball in space.