The trial and death of Socrates by Stephen Baczkiewicz (audio)
During his trial, Socrates informs the Athenian assembly that he feels that he was sent by the gods to goad the Athenians out of their political and philosophical complacency. He likens his role to that of a gadfly that pesters a horse until it responds.
He argues that he does this out of duty to Athens, to prove that all men should have the right to make philosophical enquiries. He is prepared to defend this right with his life.