How do the ideas of main characters change and how their justification develops throughout the story, in Heart of Darkness by Joseph Conrad, and Crime and Punishment by Fyodor Dostoevsky

In this essay I will be exploring the changing of the ideas of main characters in Heart of Darkness by Joseph Conrad and Crime and Punishment by Fyodor Dostoevsky and the development of their justification throughout the story. Heart of Darkness is a philosophical adventure novel written by a famous English writer Joseph Conrad, it was published in 1902.
The novel is a narrative journal of a sailor that travels up the river of Congo as a captain of a commercial vessel. Heart of Darkness is an extraordinary novel and it has overstepped the framework of its genre. Heart of Darkness portrays the fearsome and psychologically sophisticated story of the struggle between civilization and the wild untamed nature. The captain of the vessel is named Charlie Marlow, initially his aim is to take ivory out of Africa and with it an ill agent named Mr. Kurtz because of who Marlow’s reality starts to change. Kurtz is one of the key character in the novel. He was called the “universal genius”, who is extremely intelligent but unfortunately falls under the influence of human instincts like greed. Nobody from the people who surround him can help him, in fact the opposite, he is considered to be godlike, for instance, because of his origin:
“On my asking who Mr. Kurtz was, he said he was a first-class agent;