Investing Real Money vs Paper Portfolio

My Dearest Moo Moo Cow,

Here is a nice quote taken from Warren Buffett's 2007 AGM.

Read everything you can. I read every book on investing in the Omaha Public Library. Fill up your mind with competing thoughts and decide what makes sense. Then jump in the water and start investing real money, rather than a paper portfolio. The difference between investing real money and is the same as reading a romance novel and actually dating. There’s nothing like experience. The earlier you start, the better. - Warren Buffett 2007 AGM.