what sophocles trying to prove in oedipus

Never kill your Dad and marry your mother! I'm trying to be a little funny but this is largely a thematic question. There are a few important themes. I'll chose one but check out the GradeSaver themes page as well. I think sight and blindness is a major commentary by Sophocles. Teiresias holds the key to the link between sight and blindness - for even though he is blind, he can still see and predict the future (if not the present). At the end of the play, moreover, Oedipus blinds himself, because what he has metaphorically seen (i.e. realized) leaves him unable to face his family or his parents in the afterlife). As with the previous theme, sight/blindness operate both literally and metaphorically within the play. Indeed, literal sight is juxtaposed with 'insight' or 'foresight'.