What is John Proctor's motivation in the crucible?

Answer: His main motivation was to be honest and authentic, but he also was motivated by the guilt and by his love for Elizabeth.

Explanation:

In the play, John was a farmer with a wife and children. He was known for being an honest man, and he sees himself as such despite being dishonest with his wife by practicing the adultery. During the play he is motivated to find falsehood and expose it (ex. Exposing the lies about the witchcraft and witch trials), he dislikes hypocrites, but he is one himself, that is why at the end, by refusing to save his own life with a lie, he is attempting to prove to himself that he is an honest person.