Question: Who is Baal HaSulam referring to when he writes of those that are “wise in the heart”?
Answer: “Wise in the heart” is one that is searching for a way to open his heart to a higher wisdom (“Wisdom” – “Hochma”), a wisdom of unity, by means of connecting with others.
We wish to connect with our hearts, to connect our desires, and from all the hearts and the sum total of all desires to choose only those that are ready for connection. By creating a connection between these desires we create a common network inside which we wish to begin to act.
While inside this network we forget which desires belong to whom because it is now our common system. Then within it we begin to sense the Light of Hochma and therefore are called wise in the heart. After all, we reveal the Light of Hochma (wisdom) within the connection of our hearts.
From the 1st part of the Daily Kabbalah Lesson 9/11/12, Panim Meirot UMasbirot