These don't conflict.
Being absolutely certain that something is going to happen doesn't mean you have to be attached to that. There just comes a point where you know that there is no other possibility, that there can be no other outcome. Once you're at that point, you can stop fretting about it, and stop worrying about it, because you know.
It looks like a paradox at first, yes, but when you experience it, you find that it's not a paradox at all.
