If you roll dice, you know that the odds are one in six that the dice will come up on a particular side. So you can calculate the risk. But, in the stock market, such computations are bull - you don't even know how many sides the dice have!
Nassim Nicholas TalebWe cannot truly plan, because we do not understand the future-but this is not necessarily a bad news. We could plan while bearing in mind such limitations. It just takes guts.
Nassim Nicholas Taleb