"Another thing, of course, is that life will have terrible blows in it, horrible blows, unfair blows. It doesn't matter. And some people recover and others don’t. And there I think the attitude of Epictetus is the best.
"There are known knowns. There are things we know we know. We also know there are known unknowns. That is to say, we know there are some things we do not know. But there are also unknown unknowns, the ones we don't know we don't know."
