Grey's Anatomy Quotes: Can't Fight Biology

Meredith [voiceover]: Biology determines much of the way we live. From the moment we're born we know how to breathe and eat. As we grow older, new instincts kick in. We become territorial, we seek shelter… And most important of all, we reproduce. Sometimes biology can turn on us though. Yeah, biology sucks sometimes.
Meredith: [voiceover] Biology says that we are who we are from birth. That our DNA is set in stone. Unchangeable. Our DNA doesn't account for all of us though. Life changes us. We develop new trades. Become less territorial. We stop competing. We learn from our mistakes. We face our greatest fears. For better or worse. We find ways to change our biology. The risk, of course is that we can change to much, to the point we don't recognize ourselves. Finding a way back can be difficult. There is no compass, no map. We just have to close our eyes, take a step and hope to God we'll get there.