“I must think over things for myself and get to understand them.”
Nora claims the responsibility to examine received beliefs for herself, making independent thought part of her attempt to understand her own identity and circumstances.
Source details
A Doll’s House, Act III, R. Farquharson Sharp translation, Project Gutenberg #15492. Nora Helmer says she must think things over for herself during the final confrontation with Torvald, after saying she must educate herself and stand alone. This is fictional dramatic speech, not Ibsen autobiography or contemporary family / legal guidance.