Question: It is said that “The Lord will open the eyes of his heart.” What does the “eyes of his heart” mean and how can they be opened?
Answer: To open the eyes of the heart means that the heart is wise and that it understands. Eyes are the vessel of Hochma and the heart is the vessel of Bina. When these vessels connect as Aba ve Ima (father and mother), as Hochma and Bina, a person begins to feel Hochma within the heart.
Our heart is a desire to receive, a desire to enjoy. The heart is corrected when it acquires the attribute of bestowal, the Light of Hassadim. I can understand the hidden reality that manages us according to the Light of Hassadim that is dressed in the heart. Then my heart becomes a wise heart, a heart that understands, a heart that feels.
It doesn’t simply feel the corporeal desire to enjoy but also the true reality. This means that I have acquired the wisdom of the heart. There is a correction in the desire called a heart that is performed by the Light of Hassadim and then Hochma is dressed in Hassadim. Then it is said that the heart understands, and such people are called wise-hearted, since they have received the correction of Hassadim and of their desires. The Hassadim are so corrected that they can also receive the Light of Hochma and receive in order to bestow, then the heart begins to see.
From the 3rd part of the Daily Kabbalah Lesson 3/20/14, Writings of Baal HaSulam