The Gödel Incompleteness Principle

Yeah you need to know:

The Gödel Incompleteness Principle: Czech-born mathematician Kurt Gödel proved that at the margins of any large logical system, such as arithmetic, or conceptual construct, such as Newtonian physics, problems would arise that could not be solved without going outside the system itself. If the system were enlarged to include these problems' solution, it would lose its integrity as a system. Hence all systems must be incomplete. In ethical terms, Gödel's liberating discovery means that no one ethical system will work for every problem, and that the fact that such a system does not solve a particular problem does not mean the system is invalid.

You know you want to read more. Here's the Wikipedia Link. And here is where I came across this definition. There are others of interest, but don't worry, when I get dry I'll post some others here.