A program designed for inputs from people is usually stressed beyond breaking point by computer-generated inputs.

The only way to learn a new programming language is by writing programs in it.

Twenty percent of all input forms filled out by people contain bad data.

UNIX is simple. But It just needs a genius to understand its simplicity.

A language that doesn't have everything is actually easier to program in than some that do.

... with proper design, the features come cheaply. This approach is arduous, but continues to succeed.