In my opinion/belief, knowing comes from experience. Without an experience it is just a belief. This does get complicated being that everything is constantly changing. What you know about yesterday is only a belief about tomorrow. For example, everytime I clicked on Internet Explorer my internet came on. It is only a belief that the next time I click it'll come on again, even though I know it did all the other times. The next time I click on it some evil person with superb programming knowledge may have sent some new virus to my computer to stop the INTERNET FROM WORKING! DAMN ALL SPYWARE TO HELL!!!!

Sorry, I got a little carried away, but you get the idea.