There is nothing respecting which a man may be so long unconscious as of the extent and strength of his prejudices.
I'm not saying that Sam J. Jones was Flash Gordon - there's no such thing. No actor can be the person, that's a bunch of crap. People pay to see an actor be himself, whether he plays Hamlet or whatever.
One of the things I realized early in my career is that you do what you believe, in knowing that if you don't, you will never like yourself. When you compromise out of fear or ambition, it eats inside you.