Knowing too much of your future is never a good thing.

Strange things conspire when one tries to cheat fate

The thing about fate, Magnus: even if we can't change the big picture, our choices can alter the details. That's how we rebel against destiny, how we make our mark. What will you choose to do?

You can tell the future?'
'More like the future mugs me from time to time.' Rachel said
'I speak prophecies. The oracle spirit kind of hijacks me once in a while, and speaks important stuff that doesn't make any sense to anybody. But yeah, the prophecies tell the future.

The wind god Favonius had warned him in Croatia: If you let your anger rule you … your fate will be even sadder than mine. But how could his fate be anything but sad? Even if he lived through this quest, he would have to leave both camps forever. That was the only way he would find peace. He wished there was another option – a choice that didn’t hurt like the waters of the Phlegethon – but he couldn’t see one.

She had to go on this quest. The fate of the world might depend on it. But part of him wanted to say: Forget the world. He didn’t want to be without her.