答案很多，我最喜欢的是李察基尔的一部老电影《谈谈情跳跳舞》里的对话：

- Passion?

- No.

Because we need a witness to our lives,

Theres a billion people on the planet, I mean, what does any one life really mean?

But in a marriage, youre promising to care about everything.

the good things, the bad things, the terrible things, the mundane things,,,

All of it. All the time, everyday.

Your life will not go unnoticed, because I will notice it,

Your life will not go unwitnessed,because I will be your witness.