JOHN
Now do listen, Mary, do listen. He never turned up. I got a letter from him apologising to me before I posted mine to him. It turned out he never meant to help me, mere meaningless affabilities. He never came to London that day at all. I should have taken the next train back. That can't affect the future.
MARY
N-no, John. Still, I don't like it.
JOHN
What difference could it make?
MARY
N-n-no.
JOHN
Think how we met. We met at ARCHIE's wedding. I take it one has to go to one's brother's wedding. It would take a pretty big change to alter that. And. you were her bridesmaid. We were bound to meet. And having once met, well, there you are. If we'd met by chance, in a train, or anything like that, well, then I admit some little change might alter it. But when we met at ARCHIE's wedding and you were her bridesmaid, why, Mary, it's a cert. Besides, I believe in predestination. It was our fate; we couldn't have missed it.