Question: Are the shapes of the Hebrew letters connected to the qualities they symbolize?
Answer: Of course they are. These letters were discovered by Adam HaRishon (the First Man) after he entered the spiritual world. That is why, since that time forward, Kabbalistic works are written using these letters, either in Hebrew or Aramaic (the letters are the same). The language is chosen according to the forms of expression of the Creator’s actions: If an action of the Light is expressed, it is recorded in Hebrew, while if an action of the Kli (vessel) is expressed, it is recorded in Aramaic.
The shapes of the letters, their order, and grammar are left unchanged since they are defined by the two Lights of Hassadim (Mercy) and Hochma (Wisdom), or the two forces, two desires: receiving and bestowal. The screen between them builds all the shapes of the letters.
They are stipulated by Aviut (coarseness), the three lines, the qualities of the first nine Sefirot to which Malchut wants to be similar. Then, with the help of various combinations of these forms, Malchut finds self-expression and resembles Keter completely.
The Torah, from the first letter to the last, describes to us the Light, but in the perspective of the vessels. If you undergo all of these forms with your desire, with your screen, with your efforts, then you will correct yourself completely.
From the 1st part of the Daily Kabbalah Lesson 12/19/10, “Introduction of The Book of Zohar,” Article “The Letters of Rabbi Amnon Saba”