Controlling complexity is the essence of computer programming.

Each new user of a new system uncovers a new class of bugs.

The most effective debugging tool is still careful thought, coupled with judiciously placed print statements.

Debugging is twice as hard as 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.

Trying to outsmart a compiler defeats much of the purpose of using one.

If you had done something twice, you are likely to do it again.

Get the weirdnesses into the data where you can manipulate them easily, and the regularity into the code because regular code is a lot easier to work with