A question I received: What does Light mean in the spiritual sense? What is the difference between the Light in the lower spiritual worlds compared to the higher ones that are closer to the Creator?
My Answer: Everything that is received in the Kli (the soul) is called Light. See this definition in Talmud Eser Sefirot. The difference between the Lights is not the Lights in and of themselves, but the vessels, Kli, the desires they fill – the measure of bestowal, the force of correction.
Likewise, the light in our world is simple and white, but it consists of the seven lights or colors because potentially it can be revealed by the seven kinds of Kli. However it doesn’t exist on its own. There is no Light outside the Kli; there is no Creator outside creation.
We only study matter and its form. We are unable to study the abstract form and the essence since we can’t attain them in a reliable way. In outer space, there is no light, but only darkness, because there is no object that could stop it or reflect it – there is no Kli.
Thus, when light goes through glass, which absorbs one of the light’s components, it is perceived as the absorbed light. If the glass absorbs red waves, then the light is perceived as red. So we don’t sense the Light in and of itself, but only its expression in the soul. More accurately, the soul’s or desire’s reaction to something external in the spiritual world is called Light. In other words, the Light is the property of bestowal which the soul has attained and which it now senses. So we don’t see the Light, but the properties of the Kli or soul, which are expressed through something called Light.