Wait a minute. Didn't that coach say quitting was a bad idea?- Seth Godin, The Dip [one of the books given to us from Dream Year DC]
Actually, quitting as a short-term strategy is a bad idea. Quitting for the long term is an excellent idea.
I think the advice-giver meant to say, "Never quit something with great long-term potential just because you can't deal with the stress of the moment." Now that's good advice.