You told DeWitt that when you were young, you could create tears. The destruction of the siphon allows that again.

[There was so much more to it, but that was all she needed to know. For now, at least.]

You're able to choose when you go, not just where, and... There is no way to really end the cycle unless it never begins.

[And so the Prophet is drowned before he could ever be born again. But that, especially, he can never tell her. She'll have to learn that for herself or hear it from DeWitt.]