Blessed are those who hunger and thirst for righteousness, for they will be filled.
Again there is the value of recognizing a need, seeing a hole that needs to be filled.
Thinking everything is all figured out, complete, finished, means there is no room for improvement (so the unacknowledged hole still remains).
Righteousness is the state approved by God. So, a desire to have his heart and character should be right on the money.
I think this hunger is both for oneself (personal) and for the world (the kingdom of God).