1) '''And this also,' said Marlow suddenly, 'has been one of the dark places of the earth.'''

2) [On the civilised conquerors of barbaric early London] ''What saves us is efficiency---the devotion to efficiency. But these chaps were not much account, really. They were no colonists; their administration was merely a squeeze, and nothing more, I suspect. They were conquerors, and for that you want only brute force---nothing to boast of, when you have it, since your strength is just an accident arising from the weakness of others. They grabbed what they could get and for the sake of what was to be got. It was just robbery with violence, aggravated murder on a great scale, and men going at it blind---as is very proper for those who tackle a darkness.''

3) [On Kurtz's displaying shrunken heads on posts] ''They only showed that Mr Kurtz lacked restraint in the gratification of his various lusts, that there was something wanting in him---some small matter which, when the pressing need arose, could not be found under his magnificent eliquence. Whether he knew of this deficiency himself I can't say. I think the knowledge came to him at last---only at the very last. But the wilderness had found him out early, and had taken on him a terrible vengeance for the fantastic invasion. I think it had whispered to him things about himself which he did not know, things of which he had no conception till he took counsel with this great solitude---and the whisper had proved irresistibly fascinating. It echoed loudly within him because he was hollow at the core...''