"The living is not perfect because it is liable to change; the dead is not perfect because it does not live."

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Generally you should act somewhere between P40 and P70, as I call it. Sometime after you have obtained 40 percent of all the information you are liable to get, start thinking in terms of making a decision. When you have about 70 percent of all the information, you probably ought to decide, because you may lose an opportunity in losing time.

— Colin Powell