The will of God be done — a sentiment from “The Lord’s Prayer,” based on Matthew 6:9-13, which begins:
Our Father which art in heaven, Hallowed be thy name, Thy kingdom come, Thy will be done in earth, as it is in heaven.
But since Ludlow seems to be taking on agony in order to save his companion, see also the story of Jesus’s anguish in Gethsemane, told in Matthew 26, where he concludes finally:
“O my Father, if this cup may not pass away from me, except I drink it, thy will be done.”