The phrase "In the end we all do what we must" appears to be a reference to the song "Still Alive" sang by the A.I. GlaDOS in the game Portal:
Aperture Science:
We do what we must
because we can
For the good of all of us.
Except the ones who are dead.
--76.216.220.191 15:33, 6 November 2019 (UTC)