¿Do you know who you are?

"If there's one thing I've learned over the years is that it only takes one person, one moment to change your life forever. To change your perspective, your way of thinking... To force you to re-evaluate everything you think you know, to make you ask yourself the toughest questions: 
¿Do you know who you are? 
¿Do you understand what's happened to you? 
¿Do you want to live this way?"

From Grey's Anatomy, brilliant.