Marriage is like kids. What does it expect? Blood.

I remember a guy who planned to join the Marines when I was a kid. Every time I saw him he was doing push-ups. All the time. A neighbor - who was ex-military or maybe even a Marine himself - told me that was all well and good but had limited utility. If you go can do 100 push-ups when you go through boot camp they'll make you do 110. They want blood.