When you leave the camp, leave it a bit better than you found it . From this presentation (which I found interesting, but very annoying at times, and the beginning is simply too silly)(via Victor Hurdugaci). Which applied to code is:
Leave the code you fix a bit better than you found it. Fix one small thing or two. Rearrange some code. make it work a bit better.
I think it's an incredibly good piece of advice - bugs usually creep in badly written code - and by fixing badly written code whenever you see it you might fix a bug before it appears.
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