Assuming you've written it correct the second time. If not, now you've got a deeper problem because it's most likely more complex. If things are waiting and coping with something to be written once again, how have you used your time to decide what needs to be re-written, versus something else that will probably be used more than you expected and needs a serious rewrite.

If you write code and don't think it needs to be rewritten, you are either an expert in your domain, or believe you have written code that fits your problem perfectly. Again, if you are not an expert in your domain, then what you have written is at best a solution that works without a second thought, but more likely could use another rewrite. Most software does not need a rewrite, but if we're talking about ways to reuse in a thousand ways, rather than a hundred ways, you need to have the luxury to rewrite code that is used in so many places that it's almost required.