What for those who don't, Meredith?

We like to think that we are rational beings. Humane, conscientious, civilized, thoughtful. But when things fall apart, even just a little, it becomes clear: we’re no better than animals. We have opposable thumbs, we think, we walk erect, we speak, we dream. But deep down, we’re all still rooting around our primordial ooze, biting, clawing, scratching out an existence, in the cold dark world like the rest of the tree toads and sloths.

There’s a little animal in all of us, and maybe that’s something to celebrate. Our animal instinct is what makes us seek comfort, warmth, a pack to run with. We may feel caged, we may feel trapped… but still, as humans, we can find ways to feel free. We are each other’s keepers. We are the guardians of our own humanity. And even though there’s a beast inside all of us… what sets us apart from the animals is that we can think, feel, dream, and love. And against all odds, against all instinct… we evolve.

Grey's Anatomy
S04E12