When courage is looked up in the dictionary it is defined as "The state or quality of mind or spirit that enables one to face danger, fear, or vicissitudes with self-possession, self-sacrifice, confidence, and resolution; bravery." I feel this one word simply describes the base of decisions made by two of The Crucible's main characters and one supporting character.
John Proctor: this man was an average citizen in Salem. He owned land, took care of that land along with his wife and children. When is wife Elizabeth became ill, Abigail came to take care of the Proctor household while Elizabeth wasn't able to. Abigail was a young girl who had feelings for John. As the story went on John had an affair with Abigail. Soon after this took place Elizabeth decided that Abigail's help was no longer needed. John was not the only one who knew that Abigail was not truthful about what she claimed to see or feel when she was in the presence of other young girls whom were being accused of witchcraft, like Elizabeth, John Proctors wife. He could see that Abigail wanted Elizabeth to hang so that she would be able to have John. The only way for John to prove this was to confess that he committed adulatory with Abigail. On page 101 and 102 Abigail starts to describe what she has been experiencing and blaming others. John interrupts her and yells out "How do you call heaven? Whore! Whore!" people ask him why he is screaming these words at her and he explains- I have known her sir, I have known her A man would not cast away his good name. You surly know this she thinks to dance with me on my wife's grave! God help me I lusted but it is a whore's vengeance, and you must see it; I set myself entirely in your hands. I know you must see it now." This took courage. John Proctor confessed his deepest secret to save his wife and to show that Abigail was not entirely honest. He was ashamed of his actions and knew others might look down on him for this mistake but aside from those facts confessed to protect someone he loves, and as the definition states, courage is about self-sacrifice.