Plato wrote two of his most famous works, The Republic and The Dialogue. In The Republic, Plato described his theory of forms, wherein he proposed that there is an ideal world of perfect, eternal ideas that is separate from the imperfect, ever-changing material world that we perceive with our senses. He defined truth as being perfect and eternal, and thus not something that can be found in the imperfect material world. Plato believed that education should aim to lead students from the imperfect material world to understanding the perfect, ideal forms. He advocated for a rigorous curriculum and lifelong education system focused on developing civic and military leaders, workers, and civil servants to serve the ideal state.