Grey's Anatomy, Season 7

Meredith:
[voiceover] Every pressurized system needs a relief valve, there has to be a way to reduce the stress, the tension before it becomes too much to bear. There has to be a way to find relief because if the pressure doesn't find a way out it'll make one. It will explode. It's the pressure we put on ourselves that's the hardest to bear. The pressure to be better than we are. The pressure to be better than we think we can be. It never ever ever lets up. It just builds and builds and builds.