Requirements in mathematical language are no use unless they are easier to read than the code.
Copy and paste is a design error.
One bad programmer can easily create two new jobs a year.
Whenever anyone says, 'theoretically', they really mean, 'not really'.
Complexity is not a goal. I don't want to be remembered as an engineer of complex systems.
As a rule, software systems do not work well until they have been used, and have failed repeatedly, in real applications.