By periodically investing in an index fund, the know-nothing investors can actually outperform most investment professionals.

A stock doesn't know that you own it.

Our approach is very much profiting from lack of change rather than from change. With Wrigley chewing gum, it's the lack of change that appeals to me. I don't think it is going to be hurt by the Internet. That's the kind of business I like.

One observer commenting on security analysts over forty stated: "They know too many things that are no longer true." As long as I am "on stage", publishing a regular record and assuming responsibility for management of what amounts to virtually 100% of the net worth of many partners, I will never be able to put sustained effort into any non-BPL activity. If I am going to participate publicly. I can't help being competitive. I know I don't want to be totally occupied with out-pacing an investment rabbit all my life. The only way to slow down is to stop.

Consciously paying more for a stock than its calculated value - in the hope that it can soon be sold for a still-higher price - should be labelled speculation

I'm always interested in understanding the math of things and understanding as much as I can about all aspects of business. And what I learn today may be useful to me two years from now. That's really the wonderful thing about investments is your knowledge is cumulative.

You ought to be able to explain why you’re taking the job you’re taking, why you’re making the investment you’re making, or whatever it may be. And if it can’t stand applying pencil to paper, you’d better think it through some more. And if you can’t write an intelligent answer to those questions, don’t do it.