Another key element to Thelemic mysticism is the ability to concentrate. This skill has two modalities: the first is the rapid, accurate, and efficient movement of thought (which is the realm of magick) and the other is the stopping of thought altogether (which is accomplished in Yoga). In the first, it is the manipulation of all ideas into one idea, and in the second is the taking of that one thought and reducing it to nothing. Of this skill, Crowley writes: