Who is Equality 7-2521, and what is his sin?

Equality 7-2521 is a man who has always been too curious and too intelligent for his peers and his society. He finds a secret tunnel where he conducts scientific experiments and rediscovers electricity. He tries to show the World Council of Scholars his electrical invention, but he is forced to run away from the City and is joined by Liberty 5-3000, whom he loves and who calls him "the Unconquered." In the process, he realizes the dangers of collectivism and, upon learning the word "I," renames himself "Prometheus." His sin is keeping a journal (diary).