Every once in awhile you run across one of those quotes you're envious of because it wasn't you who elicited it.
In this case, it was the peerless Charles Pierce in his essay on the 100th anniversary celebration at Fenway Park last weekend. And the quote in question comes from Pedro Martinez, who was explaining why he finally retired from baseball:
"You know what hit me? I was watching my little boy play, and he didn't know how to throw the ball right. There's one thing I've learned in my life, and that's how to throw a baseball, and my son didn't know how to do it right because I wasn't there to teach him. That hit me very hard."