All the Pretty Horses: Foil 1 key example

Although John Grady’s misfortunes have traumatized and injured him, he remains steadfast and dedicated to his vision of justice—even going so far as cauterizing his own gunshot wound in the passage just prior. In contrast, the Captain (who has endured very little in comparison to John Grady) is completely subdued and dejected. He sits "slumped" and "much reduced by his adventures." This unflattering picture of the Captain makes John Grady seem admirable in comparison. 

Although the novel sometimes depicts John Grady as foolhardy and naive, this passage seems to suggest that his penchant for justice and loyalty to his friends is actually a strength. Even though he has endured a lo —and often made situations worse for himself with misguided behavior—he is still braver and more resilient than the Captain. This favorable view of John Grady is not the romanticized, idealistic one he may have had of himself at the novel's opening but a realistic affirmation of his desire to act justly.