What problem does doctor faustus encounter when he first summons Mephistopheles?

When Doctor Faustus first summons Mephistopheles, he is initially met with confusion and fear, as the devil is reluctant to appear before him. Faustus struggles with the realization that his pact with Lucifer might not yield the power and knowledge he desires. Additionally, he grApples with the moral implications of his actions and the consequences of selling his soul for earthly gains. This tension reveals Faustus's internal conflict between ambition and the weight of his choices.