Don't stop with your first draft.
Where there are two bugs, there is likely to be a third.
If everybody's behavior can be explained by simple stupidity and greed, there's no point in assuming a conspiracy.
Never put off until tomorrow what you can put off forever.
Beyond 100,000 lines of code, you should probably be coding in Ada.
My definition of an expert in any field is a person who knows enough about what's really going on to be scared.