Answer: In the hierarchy of development, the letter “Aleph” appears much later in the world of Atzilut. In the upper world, the letter “Yud – י״ appears first and the letter ״Bet״ created our world in the upper world, “Bereshit” (in the beginning) because this letter specifically teaches about the beginning.
In the preface to The Book of Zohar, the article, “The Letters of Rabbi Hamnuna-Saba,” tells about all the letters of the Hebrew alphabet.
Question: In that article, it is said that every letter “approached” the Creator and “asked” to begin the creation of the world, and the Creator found some defect in every letter. What does it mean that the letter approached and asked “begin with me”?
Answer: It means that the Creator elicited the attitude of each letter to His Light, whether or not it was capable of being the beginning of the program of the development of His creation. It became clear that only the letter ״Bet״ was “capable” of creating the world because the word “Bracha” (blessing) begins with it.
In the letter ״Bet״ there is a connection between the letter itself, which already is a Kli (creature), and the Creator (Light). An inner connection like this doesn’t exist in any other letter. Without a blessing, without that intrinsic characteristic that exists in the letter ״Bet,״ the rest of the letters would have been cut off from the Light and would not be able to conduct or hold its energy, its power.
From the Kabbalah Lesson in Russian 7/17/16