What is the difference between an investor and a gambler?

With reference to Robert Kiyosaki Cashflow Quadrant, the I quadrant stands for Investor, where you let your money work for you, by investing them. When is an investor like a gambler?

An investor who invest without any sound analysis and purely rely on gut feel will be like a gambler. Investor and gambler is different by the way they approach the investment. One based on knowledge and the other based on feeling.