It is obvious from the foregoing that evolution takes place under the influence both of normally progressive beings and of those who lag behind. Clairvoyant vision is able to trace the co-operation of both classes of beings in the supersensible world, and hence is able to comprehend the spiritual events of which the physical facts surrounding humanity are the manifestations. We observe that, in order to understand cosmic events, it is not enough to have spiritual eyes and ears opened to the spiritual world by some kind of exercise. This only means that we _see_ what is there, that we are cognizant of spiritual beings and know that they are entities of the soul-world or spirit-sphere. But it is also necessary to recognize what kinds of beings they are. We may meet some being of the soul or spirit world, but we do not necessarily know whether it is progressing in its evolution, or whether it belongs to the category of powers that have lagged behind; whether therefore it is pushing evolution onwards, or hindering it. Those people who acquire clairvoyant faculties and do not at the same time gain complete understanding of the conditions of human evolution which we have described may know absolutely nothing of the nature of the beings whom they meet. Mere clairvoyance must be supplemented by clear judgment of what is seen in the supersensible world. There is urgent necessity for this especially in our own time, but it had not always to be so much considered. If we go back to very ancient civilizations, we find different conditions. If in the most ancient Egyptian times a person was clairvoyant, and was confronted with a being from the supersensible world, the latter had, as it were, written on his forehead who he was. The clairvoyant could not mistake him. Now, however, the possibility of misunderstanding is very great. Whereas humanity in early times still stood very near the kingdom of the spiritual hierarchies and could see what beings it was meeting, it is now very easy to be mistaken, and the only protection against being severely injured is the effort to gain ideas and conceptions like those indicated above.