“For each and every bit of trite business advice, there is an equal and opposite bit of trite business advice”

"Fail fast" vs "be persistent"

"The first person to mention a number in a negotiation loses" vs "by saying a number, you frame the negotiations"

"Ideas don't matter" vs "the Number One startup killer … making a product for which there is no interesting market"

"Do something you're passionate about" vs "where there's muck, there's brass"

"Business plans are a waste of time" vs "failure to plan is planning to fail"

There's some valuable lesson behind all of these; I'm not saying these are bad advice.  What I'm saying is that if it were so easy, more people would be doing it successfully.  In reality, it's very difficult.

What are some of your favorite equal and opposite bits of business advice?