We live in a state of uncertainty, not just in Northern Ireland, but by virtue of being human. What I have tried to do over the last decade is to subject my former beliefs to ruthless scrutiny. Instead of searching for ways to confirm my beliefs, I have searched for ways to prove them false. When, after dispassionate examination, you cannot prove your beliefs false, then perhaps you are on the way to discovering some sort of truth.

-- Eamon Collins, terrorist-turned-informer, from his memoir Killing Rage