I know it's based on Heart of Darkness, I haven't read it yet, but I have planned to read it for a long time. The other quote is in the original Apocalypse Now, too. Not only in the Redux, if you meant that with the long one. It's in the beginning, when Willard is given the assignment.
I knew I shouldn't have posted the "The horror" yet. I had readied a couple of harder quotes to post first, I don't know why I put that one there already.
Damn! Your quote is too familiar! I just can't recall where it's from...
Btw, the Redux sucks compared to the original Apocalypse Now. Everything cut out from the original is cut out for a good reason.