My definition of an expert in any field is a person who knows enough about what's really going on to be scared.
Beyond 100,000 lines of code, you should probably be coding in Ada.
Never put off until tomorrow what you can put off forever.
Where there are two bugs, there is likely to be a third.
Don't stop with your first draft.
The stored-program digital computer has three major attributes: it is fast, it is accurate, and it is stupid. The first two attributes are often used to disguise the third.