II. Oswald Spengler I

Now taking the mineral, the plant, the animal, and the human kingdoms, the last-named may be characterized for the present time by saying that since the middle of the fifteenth century we have advanced to the thinking that makes the mineral kingdom transparent to us. So that when we look at the human being of our time, as he is inwardly, as observer of the outer world, we must say that as human being he has at this precise time developed the conception of the mineral kingdom. But then we must characterize the significance of this mineral-thinking in the way I have just now characterized it.