How is Oedipus being idealized in his discussion with the priest?

The nature
of the tragic hero is that he is a person greater than average in terms of power, intellect, and
strength, who ends up enduring suffering, partially due to fate and partially due to the nature
of his own character. Thus the play begins presentingat the height of his power, as the man who
saved Thebes by answering the riddle of the Sphinx. 

The priest wants
Oedipus' help in defeating the plague.To obtain it, he uses flattery in three ways. First, his
emphasis on how Thebans look up to and depend upon Oedipus flatters his ego. Next, in praising
Oedipus, the priest holds up a mirror to how Oedipus should behave in this crisis. Finally, he
appeals to Oedipus by suggesting that he will become an ideal to posterity as well as to the
present if he saves Thebes from the plague, and thus portrays the present ideal as something
that could be tarnished if Oedipus does not continue to benefit Thebes, saying

Dont let our memory of your ruling here

declare
that we were first set right again

and later fell.