Question: If I feel some influence of the Creator on me, then in order to convey this feeling to someone else I can draw a letter or several letters and it will already be a word. What is the difference between a letter and a word?
Answer: A letter expresses only one quality and a word expresses a sequence of qualities that flow from one to another and therefore express relationships.
Question: And all this was invented by people?
Answer: Nobody invented anything. Kabbalists were feeling the influence of the Creator on themselves and were recording it in such a way.
From KabTV’s “Spiritual States” 7/26/22