The Dow Jones Industrial Average last week ended up pretty much where it had been a little more than a week earlier. A rousing 200-point rally on Wednesday mostly made up for the distressing 200-point selloff of the previous Friday.

The Dow plummeted nearly 800 points a few weeks ago -- and then just as dramatically rocketed back up again. The widely watched market indicator is down 7% from where it stood in April and up 59% from where it was at its 2009 nadir.

These kinds of stomach-churning swings are testing investors' nerves once again. You may already feel shattered from the events of 2008-2009. Since the Greek debt crisis in the spring, turmoil has been back in the markets.

At times like this, your broker or financial adviser may offer words of wisdom or advice. There are standard calming phrases you will hear over and over again. But how true are they? Here are 10 that need extra scrutiny.

1 "This is a good time to invest in the stock market."

Really? Ask your broker when he warned clients that it was a bad time to invest. October 2007? February 2000? A broken watch tells the right time twice a day, but that's no reason to wear one. Or as someone once said, asking a broker if this is a good time to invest in the stock market is like asking a barber if you need a haircut. "Certainly, sir -- step this way!"