Observer: Do we know why he failed to carry out his instructions? Why he did not erase the lingering traces of Peter Bishop in this timeline.
Observer 2: No. That is a question only September can answer. As well as if he is responsible for Peter Bishop's return.

Fringe Season 4 Episode 14: "The End of All Things"
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Fringe Season 4 Episode 14 Quotes

Olivia Dunham. I've waited so very long to meet you.

David Robert Jones

I don't know you that well, but I'd like to think you weren't ignoring her safety for personal reasons. And that you aren't ignoring me right now!