Extra features were once considered desirable. We now recognize that 'free' features are rarely free. Any increase in generality that does not contribute to reliability, modularity, maintainability, and robustness should be suspected.

A good threat is worth a thousand tests.

A design remedy that prevents bugs is always preferable to a test method that discovers them.

A test that reveals a bug has succeeded, not failed.

First law: The pesticide paradox. Every method you use to prevent or find bugs leaves a residue of subtler bugs against which those methods are ineffective.

In programming, it’s often the buts in the specification that kill you.

One of the saddest sights to me has always been a human at a keyboard doing something by hand that could be automated. It's sad but hilarious.