What is the main conflict in Faust. First Part by Johann Wolfgang von Goethe?

The play Faust is a tragedy with the main character fighting against both Mephistopheles and his own lack of self-confidence. Faust signs a pact with Mephistopheles to serve him if Mephistopheles finds something that makes Faust want to live. In the end.... the state of Faust's soul is uncertain.