PROGRAMMING : slogans wot I like

Just reading through an interview with a Mac Hacker called Jonathan Rentzsvch in which he reiterates the following 'slogan'

Each line of code is a liability

I like that, it's very in line with DRY and the ruby way...

Don't Repeat Yourself

Another Pragmatic Programmer slogan is

Keep it DRY, shy and tell the other guy

But I don't really like that one much - a bit smarmy for some reason.
Finally, one the slogans I've been banging around a lot lately (because it is fundamental, and is ultimately the base of all the above slogans) comes from that book I didn't like by Glass

25% increase in problem complexity results in a 100% increase in solution complexity