to improve software quality by increasing the amount of testing is like trying to lose weight by weighing yourself more often. If you want to lose weight, don’t buy a new scale; change your diet. If you want to improve your software, don’t test more. Develop better. — Steve McConnell, Code Complete
writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it. — Brian W. Kernighan