Question

What part of the script brings out the theme of forbidden knowledge? PLEASE HELP

CHORUS: Cut is the branch that might have grown full straight,
And burned is Apollo's laurel bough,
That sometime grew within this learned man.
Faustus is gone; regard his hellish fall,
Whose fiendful fortune may exhort the wise
Only to wonder at unlawful things,
Whose deepness doth entice such
forward wits To practise more than heavenly power permits