Mattey elaborates further on the positive, redeeming aspect of the seemingly bleak, frustrating themes of existentialism that are so apparent in "Nausea": "Sartre considered the subjectivity of the starting-point for what a human is as a key thesis of existentialism. The starting-point is subjective because humans make themselves what they are. Most philosophers consider subjectivity to be a bad thing, particularly when it comes to the motivation for action... . Sartre responds by claiming that subjectivity is a dignity of human being, not something that degrades us." Therefore, the characteristic anguish and forlornness of existentialism are temporary: only a prerequisite to recognizing individual responsibility and freedom. The basis of ethics is not rule-following. A specific action may be either wrong or right and no specific rule is necessarily valid. What makes the action, either way, ethical is "authenticity," the willingness of the individual to accept responsibility rather than dependence on rules, and to commit to his action. Despair, the existentialist says, is the product of uncertainty: being oriented exclusively to the outcome of a decision rather than to the process yields uncertainty, as we cannot decide the future, only our action.