[ALittleLight]

You still learn those things, whether lemmas or beliefs about the Big Bang, from experience. You don't necessarily have the experience of deriving these things from first principles or from evidence yourself - someone told you, you read it in a book, etc.

How did you know who or what you could trust? Why do you believe in some books and not others? Again, your experience tells you which are more trustworthy. You have experiences that make you trust textbooks and so you trust the information you get by experiencing reading the textbook.

My point is really that it's absurd to claim someone only believes something because of their experience. Everyone believes everything because of their experiences.

[axiom92]

Hmm I see your point. It's a bit abstract but makes sense to me.