Give an example from The Crucible that demonstrates that certainty can be dangerous.

In The Crucible, certainty can be dangerous as demonstrated by the character of Abigail.

She accused Proctor's wife of being a witch. She testified that she saw the spirit of Proctor's wife and it stabbed her. Even though she lied, her certainty in front of the jury and the towns people convince them that what she said is true and that Proctor's wife is a witch that must be burned to death.