"Given a 10% chance of a 100 times payoff, you should take that bet every time." — Jeff Bezos

Most people dismiss many of the best and most profitable investment ideas simply because they probably won't work. These investors never stop to consider how much they could make if unlikely outcomes actually occur. Jeff Bezos took those bets and became the richest person in the world.

"It's not whether you're right or wrong that's important, but how much money you make when you're right and how much you lose when you're wrong." — George Soros

"With a good perspective on history, we can have a better understanding of the past and present, and thus a clear vision of the future." — Carlos Slim Helu

It's far too easy for investors to lose perspective. Whenever something big goes wrong, a lot of people panic and sell their investments. Looking at history, the markets recovered from the 2008 financial crisis, the dotcom crash, and even the Great Depression, so they'll probably get through whatever comes next as well.