I love you not because of who you are but because of who am I when I with you 这句话出自哪里?

是别人对你说的吗?
在文经社出版的《世界上最美丽的英文‧人生短篇》里
I love you not because of who you are,
but because of who I am when I am with you.
To the world you may be one person,
but to one person you may be the world.
这让我想到在电影《征服情海》里,Tom Cruise 所饰演的男主角 Jerry Maguire,为了挽回太太 Dorothy,结结巴巴地说：
But tonight,our little project,our company had a very big night—a very,very big night.
But it wasn’t complete,wasn’t nearly close to being in the same vicinity as complete,because I couldn’t share it with you.I couldn’t hear your voice or laugh about it with you.I miss my—I miss my wife.
接下来是一小段吞吞吐吐、不知所云的岔题话,最后他终於鼓起勇气,讲了一句虽然简单,却很经典的名言：
You complete me.