 It is less obvious in Sartre’s case that one of the requirements overrides the other. Why this is so, however, may not be so obvious. Some will say that our uncertainty about what to do in this case is simply the result of uncertainty about the consequences. If we were certain that the student could make a difference in defeating the Germans, the obligation to join the military would prevail. But if the student made little difference whatsoever in that cause, then his obligation to tend to his mother’s needs would take precedence, since there he is virtually certain to be helpful. Others, though, will say that these obligations are equally weighty, and that uncertainty about the consequences is not at issue here.