"It is said that history turns on small hinges. A human career, too, results from an accumulating series of decisions about large and small matters over a period of years. But the catch is that you can never know when a seemingly small decision may prove to be, from the vantage of later years, the big decision of your life."

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... but the important thing is that when you do find one where you really do know what you are doing, you must buy in quantity.... Charlie and I have made a dozen or so very big decisions relative to net worth, although not as big as they should have been. And in each of those, we've known that we were almost certain to be right going in.

— Warren Buffett