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You must very smart to discover new mistakes. And if you think you are then you are not.

No matter how many mistakes you work at avoiding, you're going to run smack into some you've not even dreamed possible.

Roll with them.

My point was that studing other people's mistakes is a really good thing. Some mistakes are too costly... You can't afford them.

Because one really bad mistake I'm half-blind and since then I prefer to think damn hard before making decisions.