There's a quote I love from Feynman

  > The first principle is that you must not fool yourself and you are the easiest person to fool.

I have no doubt he'd be repeating it loudly now, given we live in a time where we developed machines that are optimized to fool ourselves.

It's probably also worth reading Feynman's Cargo Cult Science: https://sites.cs.ucsb.edu/~ravenben/cargocult.html