The Persian poets, in the Sufi literature, very often speak of the glance. And their symbolical expression for the glance is, very often, a sword, and it is called a sword for various reasons. In the first place the glance has a projecting effect. An intelligent glance has a crossways movement, like that of a sword. But besides this, from a psychological point of view a keen glance sees through an object, as though a thing had been cut open by the sword and manifested to view. The glance is a power, very little is known about it. The power of the glance can hold lions at bay. Therefore also it is symbolized as a sword. The glance of a brave person is very often more powerful than a sword, for the will-power works through the glance.