I'm going to keep this one short - read the book - it's good for investors on any level.
Some of the quotes from the book:
"The idea that to get rich you need to take risk seems to imply that risk begets higher returns, but this is just a logical fallacy, like using successful gamblers as role models for investing."
"Simon Lack notes that over the 1998-2010 period, a whopping 97% of the dollar profits generated by the hedge fund industry went to the fund managers, not the investors."
This is a good one, can be used as the summary for the book:
"Risk takers dominate our lives via their disproportionate effect on our genes and their influence on our technology and culture. They did not become successful, however, merely by taking some abstract risk that is the same for everyone and then enjoy the higher rewards that came with it. They instead took the right risks, those consistent with their unique strengths, and reaped rewards consistent with a mastery of something important."
If you are still not convinced, you can read this, more thorough review.