As regards Plato, if Popper says that he finds much to admire in him, it is only to add that he feels it to be his task to annihilate what is bad in his philosophy, that is, the totalitarianism of his conception of the state. Popper assumes that the true motive power of Marx's activities was of an ethical nature. This presents us from the outset with a contradiction to the system. Popper argues (and it is one of the numerous striking disquisitions that enrich his work) that moral futurism does not in principle differ from moral positivism, the system by which Hegel, especially, based morality on existing conditions. Popper is a trained philosopher. In 1934 he entered the difficult ground of the theory of the scientific method as applied in modern physics and mathematics with a book entitled Logik der Forschung.