In at least 150 words, explain the metaphor of "cashing a check" and how it makes King's speech more effective.

The meaning behind "casing in check" is Justice vs Retribution and Revenge. It has to do with knowing who will illustrate innocence and guilt. Proctor makes one desperate bid for this authority by finally overcoming his desire to protect his good name, exposing his own secret sin. He exposes his private life to scrutiny, hoping to gain some authority, but he does not realize that too many influential people have invested energy into the proceedings for him to be able to stop them now.