A program that has not been tested does not work.
It's easy to win forgiveness for being wrong; being right is what gets you into real trouble.
Some software is actually pretty good, by any standard. Think of the Mars Rovers, Google, and the Human Genome Project. Now, that's quality software!
When done well, software is invisible.
If you think it's simple, then you have misunderstood the problem.
Always think about how a piece of code should be used: good interfaces are the essence of good code. You can hide all kinds of clever and dirty code behind a good interface if you really need such code.