Well if you question your beliefs then you can arrive at your first principles, and then you can start questioning things people tell you by ensuring that you understand them as derived from your first principles. That's called thinking for yourself and one benefit of doing so is that when other people tell me I'm not thinking for myself, I know that they're wrong because I know that I have direct access to the truth. People who don't think for themselves rely on others for access to the truth.
