What is the characteristic blindness of our age?

When we read the writings coming from previous centuries, we say "Typical Victorian. Typical Medieval. Typical eighteenth-century." But then we have to start wondering what the characteristic blindness of our age is. We can see the problems with other ages because we aren't in them and we haven't absorbed the typical prejudices of that time. We have, however, absorbed the typical prejudices of our time, and those are hard to see. How much of what we say is going to be read by people in the future as "sooo early twenty-first century?" That's what C. S. Lewis talks about in his introduction to a fourth-century theological treatise: