In the beginning of Dr. Faustus, Dr. Faustus is contemplating on professions that can further his intelligence. He goes through various professions briefly, but does not chose any of them. Suddenly, he becomes interested in magic. The rapidness of his desire to see Valdes and Cornelius can portray his true feelings towards religion all together.
Prior to hearing what the good and bad angel had to say, Dr. Faustus arranges to see Valdes and Cornelious, but doesn’t re-evaluate his decision to learn about magic. He knows that learning about magic goes against his religion, yet until he is reminded by the good angel, he doesn’t second guess learning magic. Even after listening to both angels, he still decides to meet with Valdes and Cornelious.
Dr. Faustus knows the consequences he may be given, but intelligence and superiority is more important to him. He was not persuaded to learn about magic, but intentionally does it. In order to further his intelligence, he ultimately loses his soul and salvation.
“It is a man’s own mind, not his enemy or foe, that lures him to evil ways.”
-Buddha
We’ll think more about whether Faustus is naturally evil or not: the tragedy seems to me more painful if it is possible for a character to choose evil even if he or she has the potential to be otherwise. Note that what’s at stake here is not so much intelligence–he’s clearly a very smart guy–as knowledge.