What blinds us, or makes historical progress very difficult,...

What blinds us, or makes historical progress very difficult, is our lack of awareness that our beliefs have grown obsolete and should be put aside.... This is I think much of the problem of the modern dilemma: Direct experience has been discounted, and in its place all kinds of belief systems have been erected.... If you believe something, you are automatically precluded from believing its opposite; which means that a degree of your human freedom has been forfeited in the act of committing yourself to this belief.