This article is just way too good not to link to Speed Kills.
Some choice quotes:
Frankly, the ability to be deliberate is the mark of a professional. Professionals do not rush. Professionals understand the value of cleanliness and discipline. Professionals do not write bad code — ever.
Or how about:
If you want to be a professional, if you want to be a craftsman, then you must not rush. You must keep your code clean. So clean it barely needs comments.