I believe that everyone gets a moment of truth in their lives.   

When that moment is, you never know until it's already passed. It could be something good, like finding the cure for cancer, or it could be the second you find that someone isn't who you thought they were. But all that matters in the end is that you've found out what you need to know, and with that knowledge, you can do something great.

But if you miss it, you don't get the moment again.  

And I knew when I had found my moment, because it came with a girl named Clare.