ETA: Okay, I’ve recently found out that this quote is not Vonnegut, although he did write something similar to this in a letter to schoolchildren. That letter was posted to three–ring’s blog with her commentary posted below. Her commentary was copy-pasted to Facebook as being written by Vonnegut, and it’s been passed around that way ever since. Proof here.
I’m fixing this post with proper attribution. I did do a quick web search before posting this, but apparently it was too quick. Bleagh.
The actual excerpt does read much more like Vonnegut.
Funnily enough, even though the quote is misattributed, the sentiment is basically the same as what Vonnegut was saying, albeit less eloquent.