Look down, not up, when making your initial investment decision. If you don’t lose money, most of the remaining alternatives are good ones.

Choosing individual stocks without any idea of what you're looking for is like running through a dynamite factory with a burning match. You may live, but you're still an idiot.

The more confidence I have in each one of my stock picks, the fewer companies I need to own in my portfolio to feel comfortable.

Over the long term, despite significant drops from time to time, stocks (especially an intelligently selected stock portfolio) will be one of your best investment options. The trick is to GET to the long term. Think in terms of 5 years, 10 years and longer. Do your planning and asset allocation ahead of time. Choose a portion of your assets to invest in the stock market - and stick with it! Yes, the bad times will come, but over the truly long term, the good times will win out - and I hope the lessons from 2008 will help get you there to enjoy them.

There's a clarity that comes with great ideas: You can [easily and simply] explain why something's a great business, how and why it's cheap, why it's cheap for temporary reasons and how, on a normal basis, it should be trading at a much higher level. You're never sitting there on the 40th page of your spreadsheet, as Buffett would say, agonizing over whether you should buy or not.

I think the exercise of trying to figure out how to simplify concepts has been incredibly helpful to me over the last 13 years of teaching and I hope my students have benefited from it.

The big picture is: the main thing you should be concerned about in the future are incremental returns on capital going forward. As it turns out, past history of a good return on capital is a good proxy for this but obviously not foolproof. I think this is an area where thoughtful analysis can add value to any simple ranking/screening strategy such as the magic formula. When doing in depth analysis of companies, I care very much about long term earnings power, not necessarily so much about the volatility of that earnings power but about my certainty of "normal" earnings power over time.