The unexamined life is not worth living. Memory is necessary for all the operations of reason. Whenever possible, steal code. If you can' t write it down in English, you can't code it. The sooner you start to code, the longer your program will take.
Pi seconds is a nanocentury.
One person's constant is another person's variable. The fastest algorithm can frequently be replaced by one that is almost as fast and much easier to understand. Each new user of a system uncovers a new class of bugs. In matters of grave importance, style, not sincerity, is the vital thing. The cheapest, fastest, most reliable components of a computer system are those that are not there.