Acharya Prashant explains that the concept of duty is unique to human beings because of the nature of human consciousness. Unlike machines or animals, which act according to their design or physical instincts, humans possess a consciousness that seeks expansion, understanding, and liberation. Therefore, the central and only real duty of a human being is to attain liberation. Any action or obligation imposed by society, family, or tradition must be tested against this central principle. If an action does not lead toward liberation, it is not a true duty but a frivolous distraction that drains precious time and energy.