"Better it is toward the right conduct of life to consider what will be the end of a thing, than what is the beginning of it: for what promises fair at first may prove ill, and what seems at first a disadvantage, may prove very advantageous."

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The considerations upon which expectations of prospective yields are based are partly existing facts which we can assume to be known more or less for certain, and partly future events which can only be forecasted with more or less confidence.

— John Maynard Keynes