In Jennifer L. Armentrout's novel "Onyx," a character named Blake is addressing someone with serious anger management issues. He likens these problems to a disease that affects a person's well-being. This indicates that he believes such emotional struggles can be detrimental to one's life and relationships.
Blake suggests that the solution to addressing this anger lies in facing oneself directly and confronting the source of the problem. His blunt advice implies that one must take responsibility for their actions and work towards self-improvement, hence the humorous yet serious assertion that the "cure" involves self-discipline and hard introspection.