In The Crucible by Arthur Miller What is the significance about commandment that john proctor forgets?

The commandment that John Proctor forgets is "Thou shalt not commit adultery." This is significant because it is the one commandment that Proctor has broken, and it is the one that leads to his downfall.

When Proctor is first accused of witchcraft, he is confident that he will be able to clear his name. However, when Abigail Williams accuses him of having an affair with her, he is forced to admit the truth. This admission ruins Proctor's reputation and makes him an easy target for Abigail and the other accusers.

In the end, Proctor is executed for witchcraft. His death is a direct result of his breaking the commandment "Thou shalt not commit adultery." This shows that even in a society where people are supposed to be forgiven for their sins, there are some sins that are unforgivable.