Slim is introduced to the reader as having a "gravity in his manner and a quiet so profound that all talk stopped when he spoke. His authority was so great that his word was taken on any subject, be it politics or love." Slim is both liked and respected by everyone on the ranch. As George confides in Slim about what happened in Weed, it says that Slim's eyes were "level and unwinking." He is concentrating on George's tale and his eyes proves that he is trustworthy.
George finds it easy to confide in Slim because he alone seems to have the ability to see and understand more than what is said or seen on the surface. Slim seems to be an old soul, one that has gone through many events in his life and can therefore understand hard times and events as they happen to others. He has "God-like eyes" that invite trust and demonstrate compassion. George knows that he can trust Slim because he is kind and perceptive. Slim is actually the main hero of the novel.