Investing today may well be harder than it has been at any time in our three decades of existence.

Investment success cannot be captured in a mathematical equation or a computer program.

To achieve long-term success over many financial market and economic cycles, observing a few rules is not enough. Too many things change too quickly in the investment world for that approach to succeed. It is necessary instead to understand the rationale behind the rules in order to appreciate why they work when they do and don't when they don't.

The real secret to investing is that there is no secret to investing.

I think Buffett is a better investor than me because he has a better eye toward what makes a great business. And when I find a great business I'm happy to buy it and hold it. Most businesses don't look so great to me.

Literally draw a detailed map-like an organization chart-of interlocking ownership and affiliates, many of which were also publicly traded. So, identifying one stock led him to a dozen other potential investments. To tirelessly pull threads is the lesson that I learned from Mike Price.

As Graham, Dodd and Buffett have all said, you should always remember that you don't have to swing at every pitch. You can wait for opportunities that fit your criteria and if you don't find them, patiently wait. Deciding not to panic is still a decision.