thought then that decent, intelligent, and experienced managers would automatically make rational business decisions. But I learned over time that is… - Warren Buffett

For example: (1) As if governed by Newton's First Law of Motion, an institution will resist any change in its current direction; (2) Just as work expands to fill available time, corporate projects or acquisitions will materialize to soak up available funds; (3) Any business craving of the leader, however foolish, will be quickly supported by detailed rate-of-return and strategic studies prepared by his troops; and (4) The behavior of peer companies, whether they are expanding, acquiring, setting executive compensation or whatever, will be mindlessly imitated.

The greater the potential for reward in the value portfolio, the less risk there is.

students need only two well-taught courses — How to Value a Business, and How to Think About Market Prices. Your goal as an investor should simply be to purchase, at a rational price, a part interest in an easily-understandable business whose earnings are virtually certain to be materially higher five, ten and twenty years from now. Over time, you will find only a few companies that meet these standards — so when you see one that qualifies, you should buy a meaningful amount of stock. You must also resist the temptation to stray from your guidelines: If you aren’t willing to own a stock for ten years, don’t even think about owning it for ten minutes. Put together a portfolio of companies whose aggregate earnings march upward over the years, and so also will the portfolio’s market value. Though it’s seldom recognized, this is the exact approach

Anyone who has become rich twice is dumb. Why would you risk what you need and have for what you don’t need? If you are already rich, there is no upside to taking on a lot more risk, but there is disgrace on the downside.