The keen-pointed stiletto-like dart (Fig. 23) was a thought of steady anger, intense and desiring vengeance, of the quality of murder, sustained through years, and directed against a person who had inflicted a deep injury on the one who sent it forth; had the latter been possessed of a strong and trained will, such a thought-form would slay, and the one nourishing it is running a very serious danger of becoming a murderer in act as well as in thought in a future incarnation. It will be noted that both of them take the flash-like form, though the upper is irregular in its shape, while the lower represents a steadiness of intention which is far more dangerous. The basis of utter selfishness out of which the upper one springs is very characteristic and instructive. The difference in colour between the two is also worthy of note. In the upper one the dirty brown of selfishness is so strongly evident that it stains even the outrush of anger; while in the second case, though no doubt selfishness was at the root of that also, the original thought has been forgotten in the sustained and concentrated wrath. One who studies Plate XIII. in Man Visible and Invisible will be able to image to himself the condition of the astral body from which these forms are protruding; and surely the mere sight of these pictures, even without examination, should prove a powerful object-lesson in the evil of yielding to the passion of anger.