I think it's a good idea to read the book(the whole book) &
then think about what the author wants to say he/she believes.
I love to read non fiction for that reason. Ann Rand is a very
controversial writer but she does pose some interesting questions. Don't limit yourself on what you read. It's also good
to read a book or article that doesn't believe what she does on
many topics. Your Dad sounds like a good Dad. He wants you
to "think" & then decide for yourself what to believe. Cool.