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Attempts have been made to shed light on the riddle by transferring it to space. It is true that it there loses the greater part of its obscurity; but this apparently is because, in changing its environment, it has completely changed its nature and no longer bears any relation to what it was when it was placed in time. We are told, for instance, that innumerable cities distributed over the surface of the earth are to us as if they were not, so long as we have not seen them, and only begin to exist on the day when we visit them. That is true; but space, outside all metaphysical speculations, has realities for us which time does not possess. Space, although very mysterious and incomprehensible once we pass certain limits, is nevertheless not, like time, incomprehensible and illusory in all its parts. We are certainly quite able to conceive that those towns which we have never seen and doubtless never will see indubitably exist, whereas we find it much more difficult to imagine that the catastrophe which, fifty years hence, will annihilate one of them already exists as really as the town itself. We are capable of picturing a spot whence, with keener eyes than those which we boast to-day, we should see in one glance all the cities of the earth and even those of other worlds, but it is much less easy for us to imagine a point in the ages whence we should simultaneously discover the past, the present and the future, because the past, the present and the future are three orders of duration which cannot find room at the same time in our intelligence and which inevitably devour one another. How can we picture to ourselves, for instance, a point in eternity at which our little procession already exists, while it is not yet and although it is no more? Add to this the thought that it is necessary and inevitable, from the millenaries which had no beginning, that, at a given moment, at a given place, the little procession should leave the little church in a given manner and that no known or imaginable will can change anything in it, in the future any more than in the past; and we begin to understand that there is no hope of understanding.