The author of this article maintains that there is a progression in plato's "phaedo" from argument and myth to action. In the dialogue, socrates is portrayed as a believer in immortality. How is that belief conveyed to skeptics like simmias? it is argued here that plato deliberately employs a variety of methods because men are not convinced by rational argument. Plato's depiction of socrates' own death is itself the final demonstration.
Mendelson, A. (1981). Plato’s “Phaedo” And The Frailty Of Human Nature. Dionysius, 5, 29–39.