The statement, "Can't repeat the past? Why of course you can!" helps to develop the theme by showcasing the character's longing to go back in time and recreate the past, despite it being impossible to do so. It emphasizes the theme of nostalgia and the human inclination to try and revisit moments that are forever lost.
The statement that helps the most to develop the theme is:
"Can't repeat the past?" [Gatsby] cried incredulously. "Why of course you can!"
He looked around him wildly, as if the past were lurking here in the shadow of his house, just out of reach of his hand.
This statement contributes to the development of the theme by highlighting the character's belief in the possibility of going back in time and reliving the past. It suggests that some people have a strong desire to recreate or revisit certain moments or experiences from their past, even though it is impossible to do so. The character's incredulous tone and his searching gaze indicate his yearning for a time that is forever out of his reach.
This statement helps to develop the theme because it emphasizes the theme of nostalgia and the longing to recreate the past, which is a significant aspect of the novel. It reflects the idea that some individuals cannot resist the temptation to try and relive or recapture moments that have already passed. By highlighting this desire, the statement contributes to the overall exploration of the theme throughout the story.