In Ian McEwan's "Atonement," the character expresses a sense of vulnerability and self-awareness in his interactions with Cecilia. He acknowledges that his behavior may seem irrational or crazy, particularly in light of his feelings for her. The heat contributes to this lightheadedness, but it's primarily his emotional state that causes him to act in a way that feels out of character. This moment reflects the intensity of his feelings and the confusion that often accompanies infatuation.

The quote encapsulates the struggle between reason and emotion, as the character grapples with his attraction to Cecilia. The mention of feeling foolish highlights the awkwardness and uncertainty in romantic situations, especially when one feels deeply connected to another. McEwan's writing captures the complexity of young love and the interplay between desire and self-consciousness, setting the stage for the later themes of guilt and atonement in the novel.