And man has been struggling to restore the original world and the original self, as a method of realizing the ideal. Man tried his best to fulfill during his generation the responsibility of restoration which had been transmitted like a baton from his predecessors. But he handed his baton to the next generation and fell down. In this manner, in order to fulfill the responsibility on his shoulders, Dasein has to receive the inheritance of the past and project his self toward the future. In this sense, man is different from other living beings, and man's time has historicity.
Nullification means negation, but it is so-called freedom.
This is because the direction of nullification depends upon the decision of consciousness. Anxiety results from this freedom, and not only anxiety but also man's action results from freedom. This is the fundamental condition for free action. Since man is free, he can choose anything. So he himself decides his own destiny, that is, the content and way of his life.