From one's anger or vexation arises an adverse condition in the spiritual world, so that those forces which would open the eyes of the soul are turned away. For example, if someone should annoy me, he sends forth a current into the world of the soul. So long as I allow myself to be annoyed, I cannot see this current. My own annoyance clouds it. But from this it must not be supposed that when I no longer feel annoyed I will see the astral vision. To see an astral vision it is indispensable that the eye of the soul should already be developed; but the capacity for sight of this kind is latent in everyone. And again it is true that during the development, so long as one can be annoyed the sight remains inactive; nor does it present itself immediately, when one has overcome to a small extent this feeling of annoyance. One must continually persevere in the struggle with such a feeling, and patiently make progress: then, some day, he will find that this eye of the soul has become fully developed. Of course annoyance is not the only quality with which we have to struggle before attaining this end. Many people grow impatient or sceptical, because they have for years cultivated certain qualities of the soul and yet clairvoyance has not ensued. They have developed only a few qualities and have allowed others to run wild. The gift of clairvoyance first manifests itself when all those qualities which do not permit the development of the latent faculties are suppressed. Undoubtedly the beginnings of such hearing and seeing may appear at an earlier period, but these are only young and tender shoots which are subject to all possible error, and which, if they be not carefully fostered, may quickly die.