Baal HaSulam, Shamati #3, “The Matter of Spiritual Attainment”: Ein Sof pertains to the thought of creation, which is “His desire to do good to His creations.” This is considered Ein Sof, and it is the connection existing between Atzmuto and the souls. We perceive this connection as a “desire to delight the creatures.”
The created being can understand this only to the extent that one has a desire to enjoy in quality and quantity. A person receives from the Creator and determines His attitude to him and his attitude to the Creator.
Thus, “By Your actions we know You,” which means that we cannot say anything about the Creator but only something about His actions inside us. It is from these actions that we establish our impression of Him.
People who are in the spiritual world feel the Creator as the good that does good, and so they call Him the source of everything that is good. We, on the other hand, who have not reached the right attainment yet do not know how to define Him. Each one defines Him differently each moment.
Question: You say that the Creator is good. Is this already the Creator’s name for those who attain Him?
Answer: For those who attain Him it is. “The good that does good” is the Creator’s real name. It is an impression of the Creator, and this is how we reveal Him by yearning for Him.
From KabTV’s “Fundamentals of Kabbalah,” 12/8/19