Different Struggles

The Talmud states "the greater the man, the greater is his Yetzer Hara (Evil Inclination). On the other hand, many great rabbis have suggested that tzaddikim (the righteous) are no longer subject to the Yetzer Hara, as King David says "My heart is a vacuum within me". There is a Talmudic explanation that he had "destroyed his yetzer hara through fasting and repentance.
Rabbi Nachman offers the following interpretation, which bridges these seemingly contradictory statements. There are different kinds of yetzer hara! On he lowest level of person,the yetzer hara is simply the passions and "needs" of the body. One faces great struggles with...one's own hormones! For a person on a higher level, the yetzer hara is like a dybbuk; an external negative force. On a still higher level one's yetzer hara is a holy angel, sent to test and instruct  a person For the great tzaddikim, there is no yetzer hara other than G-d's own attribute of Stern Judgement (Midat HaDin). He is troubled by the workings of G-d himself, often incomprehensible to a mortal man. He must on the one hand reconcile his faith with what he sees, and on the other hand plead with G-d to "turn from His wrath" regarding himself; or the world! We find many Biblical figures arguing with G-d. THIS is their struggle; to perceive the mysteries of G-d's workings, and to play advocate for mankind! Rabbi Nachman says that there are innumerable divisions within each category. We each have a different struggle, but all struggle.But struggle is the key to growth!