Children and open doors
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If you're going to fail, you should at least fail when you're trying, rather than because you were too scared to try in the first place. If you were brought up to expend a lot of time and energy thinking about everything and making sure you had researched every angle before embarking on any kind of project, the big danger is that you fail to spot open doors. Or perhaps you spot them, but they light up all your defence mechanisms.