When we consider the mineral, vegetable, and animal kingdoms together with mankind, we see that not only man, but also every other being has the gift of expression. The rock expresses least and we feel least for it. We strike it and break it and quarry it and make use of it in every way, and we do not sympathize with it at all, for it does not speak to us. It tells us very little. We sympathize much more with the plant; we love it, tend it, and give it water, and because it has more expression we care more for it. But among the stones there are some that speak to us more than others; we prize the diamond, the ruby, and the emerald most. We pay thousands of pounds for them; we wear them.