Just when you think you love your kid as much as humanly possible, he goes and does something that proves you wrong - you can love him even more.
When I was a kid, one of my favorite stories was "The Velveteen Rabbit". If you've never read it, it's a story about a boy that loves a stuffed rabbit so much he becomes "real". But then the rabbit has to be burned because all of his stuff gets thrown into the fire after the kid's bout with scarlet fever. In the end a fairy rescues him and turns him into a "REAL" rabbit.
After I got done reading the story, Colin burst into tears. This story had always made me cry, too, although I can't exactly say why. Technically, it has a happy ending because the fairy rescues the rabbit from the fire. But underneath it all is a sad melancholy tale related to love, loss, and the way we are forced to say goodbye to our childhoods.
The fact that Colin intuitively picked up on the underlying themes of the story AND cried about them melted my heart.
Maybe it was his own recent, bizarre, case of scarlet fever ("The Velveteen Rabbit was written in 1922 when scarlet fever was more common), or maybe it was the deep love he feels for his own favorite stuffed animal (a giraffe named Niloc - Colin backwards), but something about the story definitely resonated with him.
When you have children you love them - that's pretty much a given for most of us. But when you really share something with your kid on a deeper level, well, that's more like meaning of life stuff.
Or at least it was for me. I am not saying that only people who are parents live lives that matter - your life has meaning regardless. But sharing that moment with this little guy I created (mostly ;)) myself, it was special. I love the fact that he is understanding love. It makes me feel like a successful mother.