Answer: Aramaic is parallel to Hebrew. These are the two most ancient languages in the world, which also have the same alphabet. When we describe and present the attributes of the Light, they are described in Hebrew, and when we describe and present the attributes of the vessel (the desire) they are described in Aramaic.
The two languages complement each other because when we study the spiritual world, the desire and the Light are two completely different, opposite categories, distant from each other. Therefore, we usually use these two languages in order to indicate these differences, and this is how they have always been revealed.
From the Kabbalah Lesson in Russian 2/5/17