This came to me in a dream

A dark haired girl ( I recall nothing else) and I were having a conversation.

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Girl: And oh, I know that subject too.

Me: How do you know so much in detail?

Girl: When I pick up a subject or a textbook, I think of myself as the Creator of that subject. If I were to build this or that theory, how would I do it? Most times, there is a correlation between mine and the textbook version.

Me: But won't that take forever?!!

Girl: The very fact that you're asking me that proves to me you've never tried it.

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For some reason, I just recall just this part of the dream. I'll be the first to admit - this quals thing is really getting on me, making me feel insecure about a whole lot of things.