It's important to note that there are LOTS of failures that can't be appraised as such in a few hours, days, weeks, or even, at times, months.
In any case, it's not just a matter of failing and moving on to something new. First of all, failing absolutely sucks, if you care about the thing that failed at all (and if you don't, your next thing will likely fail too). Second, you need to evaluate why you failed, so you can avoid making the same mistakes.
Don't dwell on them to the point of beating yourself up, but your failures deserve postmortems and recognition of the pain they cause.
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It's important to note that there are LOTS of failures that can't be appraised as such in a few hours, days, weeks, or even, at times, months.
In any case, it's not just a matter of failing and moving on to something new. First of all, failing absolutely sucks, if you care about the thing that failed at all (and if you don't, your next thing will likely fail too). Second, you need to evaluate why you failed, so you can avoid making the same mistakes.
Don't dwell on them to the point of beating yourself up, but your failures deserve postmortems and recognition of the pain they cause.