Well Roger, it looks like you received some excellent advice from your co-worker.
I think many of us are guilty of talking too much or being too vocal about certain things, when in reality, we should be listening to the conversation and then making an appropriate comment.
Blurting out the first thing that comes to our minds isn't always a wise decision.
This is an excellent quote from Abe Lincoln and again, some priceless advice from your co-worker.