Marlow's job was to help promote imperialism, however, when he discovers that cannibals are not inhumane, he begins to see that imperialism is not a necessary measure and this makes him conflict with what he believed.
Although you haven't shown it, we can see that this question refers to "Heart of Darkness."
Based on this, we can obtain the following information:
In this case, he came into conflict with his thoughts and realized that his work was established as an abuse of foreign people and not as something good, as he had been taught.
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