As there is no question included with the text, we can only look at what this quote means.
This quote comes from "Heart of Darkness" by Joseph Conrad. In this passage, we learn about the way in which Marlow thinks about the local people. He tells us that they were not inhuman, even though their behaviour was very primitive. He recognizes that, although civilization has transformed Westerners, he is still forced to recognize that there must a part within him that is of the same nature as that of the natives. In this text, Marlow is able to question some of the fundamental ideas of imperialism, without abandoning the ideal completely.