"If you understood a business perfectly and the future of the business, you would need very little in the way of a margin of safety. So, the more vulnerable the business is, assuming you still want to invest in it, the larger margin of safety you'd need. If you're driving a truck across a bridge that says it holds 10,000 pounds and you've got a 9,800 pound vehicle, if the bridge is 6 inches above the crevice it covers, you may feel okay, but if it's over the Grand Canyon, you may feel you want a little larger margin of safety..."

“Those who attended last year saw your Chairman pitch to Ernie Banks. This encounter proved to be the titanic duel that the sports world had long awaited. After the first few pitches — which were not my best, but when have I ever thrown my best? — I fired a brushback at Ernie just to let him know who was in command. Ernie charged the mound, and I charged the plate. But a clash was avoided because we became exhausted before reaching each other.”

“Risk comes from not knowing what you’re doing. "The Three Essential Warren Buffett Quotes To Live By" forbes.com”

“I could end the deficit in five minutes. You just pass a law that says that any time there's a deficit of more than 3% of GDP, all sitting members of Congress are ineligible for re-election.”

“Most companies are saddled with institutional constraints. A company's history, for example, may commit it to an industry that now offers limited opportunity. A more common problem is a shareholder constituency that pressures its manager to dance to Wall Street's tune. Many CEOs resist, but others give in and adopt operating and capital-allocation policies far different from those they would choose if left to themselves.”

“I make no attempt to forecast the general market — my efforts are devoted to finding undervalued securities. However, I do believe that widespread public belief in the Inevitability of profits from investments in stocks will lead to eventual trouble. Should this occur, prices, but not intrinsic values in my opinion, of even undervalued securities can be expected to be substantially affected.”

“Of course, Charlie and I can identify only a few Inevitables, even after a lifetime of looking for them. Leadership alone provides no certainties: Witness the shocks some years back at General Motors, IBM and Sears, all of which had enjoyed long periods of seeming invincibility. Though some industries or lines of business exhibit characteristics that endow leaders with virtually insurmountable advantages, and that tend to establish Survival of the Fattest as almost a natural law, most do not. Thus, for every Inevitable, there are dozens of Impostors, companies now riding high but vulnerable to competitive attacks.”