It's too simple to say that green means go, but in all the complexity of Gatsby's plans to win Daisy back, it's not wrong to see the green light as just what it is. Gatsby believes in light and that the light is a symbol of his endless pursuit of Daisy's affection. The green-means-go mentality is what Gatsby holds dear. Even in death and after he had been shot in the heart, the green light continued to shine brightly as Gatsby peered out over the lake from his dock each day. He doesn't say this specifically, but it becomes clear to the reader that he is in a state of denial about his future with Daisy and that the past will never repeat itself.