Their intellectual abstractions have tended to leave actual life more and more out of consideration, with the result that they have been baffled at every turn.

The more we think about it, the more we become convinced that the mysterious universe in which we live will only divulge just enough of its secrets to enable us to act, and this it gives us with comparatively little trouble on our part.

If we consider an ordinary piece of wood, we find it is hard and offers a certain resistance, and our knowledge of these elementary facts enables us to put it to use, but we shall never really solve the mysteries of its formation and growth.

These lead of course to very interesting speculations, but their solution seems to be as far off as ever.

We can know little but that which we require for life.