Cramer's 'Mad Money' Recap: Invest Like a Pro

People, Cramer said, should never buy a stock in anticipation of a quarter. In fact, they should "actively avoid" buying right before the quarter or during earnings season in general, he said. "It's just too hard.

"On this show we talk about investing in stocks, trading stocks, speculating on stocks, but there is one thing that we absolutely never do with stocks and that is gamble because when you gamble, the house always wins," Cramer said. "Trying to guess whether or not a stock will go higher after it reports earnings -- that's gambling."

He's seen so many examples of stocks going down off of great quarters that it's taught him that people absolutely should not "game the quarterly report," he said.

"You shouldn't be making snap decisions about stocks, you should be making well-considered decisions that take a lot longer because that's how you make the... mad money," Cramer said. "It's how you stay mad for life."

Want more Cramer? Check out Jim's rules and commandments for investing from his latest book by clicking here.

For more of Cramer's insights during the Lightning Round, click here.