Marlow on page 29 of the green book--about four pages for the end of Part 1:
"I would not have gone so far as to fight for Kurtz, but I went for him near enough to a lie. You know I hate, detest, and can't bear a lie, not because I am straighter than the rest of us, but simply because it appals me. There is a taint of death, a flavour of mortality in lies--which is exactly what I hate and detest in the world--what I want to forget. It makes me miserable and sick like biting something rotten would do."