Luck
To a great degree, our success or failure in the market is a function of our luck. We like to think that our results are a direct consequence of our insight and efforts, but the reality is that luck plays a big part in how we do.
Punching Bag
No matter how smart we are, or how hard we work, we will regularly be hit by news, circumstances, and developments that are unforeseen and unknowable. The stock market gods will periodically use us for their entertainment, and there is nothing we can do to prevent it, so we have to be ready and mentally prepared.
Skate.