Lord Foul's Bane
Many Metallica songs borrow from literature, and To Live Is To Die is no exception.
Take the following line:
This is actually derived, word for word and nearly line by line, from a work of fiction called Lord Foul's Bane. Written by Stephen R. Donaldson, it is the first in "The Chronicles of Thomas Covenant the Unbeliever."
In the book, the main character Covenant decides "he should write a poem." He does so, in his head, and the results are the following verses:
It has been said that Cliff Burton was a fan of Donaldson and Lord Foul's Bane, so the song To Live Is To Die is seen as a tribute to Burton.