Part 1 of Essay
A journey into the unknown "...darkness [that] was here yesterday" brings forth a sense of an embarked adventure not yet accomplished. Heart of Darkness presents this meaning fully from the main character to the purpose of an unrescued grail, (which was similiar to the legendary King Aruthur's search for the holy grail ....

Part 2 of Essay
.... knights-errant of the sea." The contrast of darkness and light (evil vs. good), illusions brought from those who have seen the grails, and the elements of the quest itself proves of Marlow's disillusioned purpose. Light and darkness contrasted throughout the novel as the "forces of evil and good." These contrasts also figuratively considered being civilized and uncivilized ( with the light representing civilization or the civilized side of the world and the dark representing the uncivilized or savage side of ....