Socrates says, as he awaits his own death, that death has to be one of two things: either it is "like being nothing, and the dead man has no perception of anything," or it is a "sort of change and migration of the soul" to another place.
The first proposition can be disputed on the grounds that life is good—that being human is about perceiving and feeling and that an end to that would be tragic, something to be dreaded. In short, if to die is really to sleep forever, it is hardly the self-evident good that Socrates attempts to portray it as. Some people could reasonably not see it that way.
His second possibility is even more contentious, for he is assuming that he will be judged after his death and that his judgment will result in his fellowship with other good men. In other words, he assumes that, if his soul survives his death and he is still conscious in the afterlife, that it will be pleasant. It assumes that the injustices of the world are not present in the afterlife, that "there...
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