Buy when most people, including experts, are pessimistic, and sell when they are actively optimistic.
Benjamin GrahamIn the old legend the wise men finally boiled down the history of mortal affairs into a single phrase: 'This too will pass.'
Benjamin GrahamEven with a margin of safety in the investor's favor, an individual security may work out badly. For the margin guarantees only that he has a better chance for profit than for loss - not that loss is impossible. But as the number of such commitments is increased the more certain does it become that the aggregate of the profits will exceed the aggregate of the losses.
Benjamin Graham