" We all reject out of hand the idea that the love of our life may be something light or weightless; we presume our love is what must be, that without it our life would no longer be the same; we feel that Beethoven himself, gloomy and awe-inspiring, is playing the "Es muss sein!" to our own great love.
Tomas often thought of Tereza's remark about his friend Z. and came to the conclusion that the love story of his life ecemplified not "Es muss sein!" ( It must be so), but rather " Es konnte auch anders sine!" ( It could just as well be otherwise".
The Unbearable Lightness of Being