The forehead also emits its own radiance. This too is something that is not seen now, but which would be visible if the radiant splendor of the forehead were visible in the same way as the radiant splendor of the other senses. For there is a very subtle fissure, and this is the secret of the Tefilin which stand on the forehead. Of the Tefilin, it is written: “And all the peoples of the earth will see that the Name of HaVaYaH is called upon you” (Deuteronomy 28:10).
Part 2: Thus all the worlds are nothing but the radiant splendor... As already stated in the commentary on the first part of the proposition, all the worlds discussed in the Kabbalah are levels of this radiant splendor....and shining glory of Adam Kadmon... Shine and radiation are the appropriate terms for that which is not the essence of a thing itself but which shines and radiates from the essence. The radiation is on a lower level than the essence itself. These worlds are thus a mere radiation that emerges from Adam Kadmon. They do not reveal all that is revealed in Adam Kadmon in itself but much less.