Make everything as simple as possible, but not simpler. One person's data is another person's program. To iterate is human, to recurse is divine. There are two kinds of people in the world, those who divide the world into two kinds of people and those who do not. 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.