Really what we did here today was simply to reconfirm what Prime Minister Tusk and I have discussed before, which is that NATO is the strongest alliance in history, primarily because it has a very simple principle, and that is we defend each other.

WHITEHOUSE: President Obama and Prime Minister Tusk Press Conference

Yet the basic principle of the cables is shockingly simple: Light goes in on one shore of the ocean and comes out on the other.

WSJ: A Dive Into the Digital Deep

We are guided by a simple principle: Protect what works about health care and fix what's broken, and do it in a way that does not add to the deficit.

CNN: Commentary: Health care can't wait