Space shapes can only be symbolical of four-dimensional shapes; and if we do not deal with space shapes directly, but only treat them by symbols on the plane--as in analytical geometry--we are trying to get a perception of higher space through symbols of symbols, and the task is hopeless. But a direct study of space leads us to the knowledge of higher space. And with the knowledge of higher space there come into our ken boundless possibilities. All those things may be real, whereof saints and philosophers have dreamed. Looking on the fact of life, it has become clear to the human mind, that justice, truth, purity, are to be sought--that they are principles which it is well to serve. And men have invented an abstract devotion to these, and all comes together in the grand but vague conception of Duty. But all these thoughts are to those which spring up before us as the shadow on a bank of clouds of a great mountain is to the mountain itself. On the piled-up clouds falls the shadow--vast, imposing, but dark, colourless. If the beholder but turns, he beholds the mountain itself, towering grandly with verdant pines, the snowline, and the awful peaks. So all these conceptions are the way in which now, with vision confined, we apprehend the great existences of the universe. Instead of an abstraction, what we have to serve is a reality, to which even our real things are but shadows. We are parts of a great being, in whose service, and with whose love, the utmost demands of duty are satisfied. How can it not be a struggle, when the claims of righteousness mean diminished life,--even death,--to the individual who strives? And yet to a clear and more rational view it will be seen that in his extinction and loss, that which he loves,--that real being which is to him shadowed forth in the present existence of wife and child,--that being lives more truly, and in its life those he loves are his for ever. But, of course, there are mistakes in what we consider to be our duty, as in everything else; and this is an additional reason for pursuing the quest of this reality. For by the rational observance of other material bodies than our own, we come to the conclusion that there are other beings around us like ourselves, whom we apprehend in virtue of two processes--the one simply a sense one of observation and reflection--the other a process of direct apprehension. Now, if we did not go through the sense process of observation, we might, it is true, know that there were other human beings around us in some subtle way--in some mesmeric feeling; but we should not have that organized human life which, dealing with the things of the world, grows into such complicated forms. We should for ever be good-humoured babies--a sensuous, affectionate kind of jelly-fish. And just so now with reference to the high intelligences by whom we are surrounded. We feel them, but we do not realize them. To realize them, it will be necessary to develop our power of perception.